Co-reporter:Yanrong Ma, Tongfei Li, Hao Chen, Xiaojie Chen, ... Yawen Tang
Journal of Energy Chemistry 2017 Volume 26, Issue 6(Volume 26, Issue 6) pp:
Publication Date(Web):1 November 2017
DOI:10.1016/j.jechem.2017.10.024
Rational synthesis of a new class of electrocatalysts with high-performance and low-cost is of great significance for future fuel cell devices. Herein, we demonstrate a general one-step simultaneous reduction method to prepare carbon-supported PdM (M = Co, Fe, Ni) alloyed nanodendrites with the assistance of oleylamine and octadecylene. The morphology, structure and composition of the obtained PdM nanodendrites/C catalysts have been fully characterized. The combination of the dendritic structural feature and alloyed synergy offer higher atomic utilization efficiency, excellent catalytic activity and enhanced stability for the formic acid oxidation reaction (FAOR). Strikingly, the as-synthesized PdCo nanodendrites/C catalyst could afford a mass current density of 2467.7 A g−1, which is almost 3.53 and 10.4 times higher than those of lab-made Pd/C sample (698.3 A g−1) and commercial Pd/C catalyst (237.6 A g−1), respectively. Furthermore, the PdCo nanodendrites/C catalyst also exhibit superior stability relative to the Pd/C catalysts, make it a promising anodic electrocatalyst in practical fuel cells in the future. Additionally, the present feasible synthetic approach is anticipated to provide a versatile strategy toward the preparation of other metal alloy nanodendrites/carbon nanohybrids.Herein, we demonstrate a general one-step simultaneous reduction method to prepare carbon-supported PdM (M = Co, Fe, Ni) alloyed nanodendrites with the assistance of oleylamine and octadecylene. Due to the dendritically structural feature and the synergistic effect of the alloyed components, the as-synthesized PdCo nanodendrites/C sample exhibits extraordinary electrocatalytic activity and excellent stability toward FAOR. Download high-res image (216KB)Download full-size image
Co-reporter:Tongfei Li;Yinjie Lv;Jiahui Su;Yi Wang;Qian Yang;Yiwei Zhang;Jiancheng Zhou;Lin Xu;Dongmei Sun;Yawen Tang
Advanced Science 2017 Volume 4(Issue 11) pp:
Publication Date(Web):2017/11/01
DOI:10.1002/advs.201700226
AbstractThe exploration of earth-abundant and high-efficiency electrocatalysts for the oxygen evolution reaction (OER) is of great significant for sustainable energy conversion and storage applications. Although spinel-type binary transition metal oxides (AB2O4, A, B = metal) represent a class of promising candidates for water oxidation catalysis, their intrinsically inferior electrical conductivity exert remarkably negative impacts on their electrochemical performances. Herein, we demonstrates a feasible electrospinning approach to concurrently synthesize CoFe2O4 nanoparticles homogeneously embedded in 1D N-doped carbon nanofibers (denoted as CoFe2O4@N-CNFs). By integrating the catalytically active CoFe2O4 nanoparticles with the N-doped carbon nanofibers, the as-synthesized CoFe2O4@N-CNF nanohybrid manifests superior OER performance with a low overpotential, a large current density, a small Tafel slope, and long-term durability in alkaline solution, outperforming the single component counterparts (pure CoFe2O4 and N-doped carbon nanofibers) and the commercial RuO2 catalyst. Impressively, the overpotential of CoFe2O4@N-CNFs at the current density of 30.0 mA cm−2 negatively shifts 186 mV as compared with the commercial RuO2 catalyst and the current density of the CoFe2O4@N-CNFs at 1.8 V is almost 3.4 times of that on RuO2 benchmark. The present work would open a new avenue for the exploration of cost-effective and efficient OER electrocatalysts to substitute noble metals for various renewable energy conversion/storage applications.
Co-reporter:Jingfei Zhang;Lijuan Qi;Xiaoshu Zhu;Xiaohong Yan;Yufeng Jia;Lin Xu
Nano Research 2017 Volume 10( Issue 9) pp:3164-3177
Publication Date(Web):15 May 2017
DOI:10.1007/s12274-017-1533-3
Co-reporter:Hao Zhang, Mengru Zhang, Meiling Zhang, Lin Zhang, Anping Zhang, Yiming Zhou, Ping Wu, Yawen Tang
Journal of Colloid and Interface Science 2017 Volume 501(Volume 501) pp:
Publication Date(Web):1 September 2017
DOI:10.1016/j.jcis.2017.04.071
Nanoporous networks of tin-based alloys immobilized within carbon matrices possess unique structural and compositional superiorities toward lithium-storage, and are expected to manifest improved strain-accommodation and charge-transport capabilities and thus desirable anodic performance for advanced lithium-ion batteries (LIBs). Herein, a facile and scalable hybrid aerogel-derived thermal-autoreduction route has been developed for the construction of nanoporous network of SnNi alloy immobilized within carbon/graphene dual matrices (SnNi@C/G network). When applied as an anode material for LIBs, the SnNi@C/G network manifests desirable lithium-storage performances in terms of specific capacities, cycle life, and rate capability. The facile aerogel-derived route and desirable Li-storage performance of the SnNi@C/G network facilitate its practical application as a high-capacity, long-life, and high-rate anode material for advanced LIBs.Download high-res image (102KB)Download full-size image
Co-reporter:Hao Sun;Lijuan Qi;Xian Jiang;Gengtao Fu;Lin Xu;Dongmei Sun;Zhenggui Gu;Yawen Tang
New Journal of Chemistry (1998-Present) 2017 vol. 41(Issue 17) pp:8812-8817
Publication Date(Web):2017/08/21
DOI:10.1039/C7NJ01755C
Metallic nanomaterials with a hollow and porous structure have attracted a great deal of interest in electrocatalysis due to their high surface area, abundant active-sites and improved metal utilization efficiency. Herein, we report an effective layer-by-layer assembly strategy to prepare a novel type of hollow porous Pt nanotube (Pt-NT) using polyelectrolyte-modified FeOOH nanorods as templates. To our knowledge, the utilization of FeOOH nanorods as templates to synthesise hollow porous Pt nanostructures has not been reported. The obtained Pt-NTs present the combined merits of a one-dimensional (1D) hollow architecture, a reactant accessible porous-surface and a large surface area (37.8 m2 g−1). As a result, superior catalytic activity and stability for the methanol oxidation reaction (MOR) are achieved with the Pt-NTs as an anode catalyst. Compared to a commercial Pt-black catalyst, the Pt-NTs exhibit a factor of 1.4 and 1.2 enhancement in mass activity (231 A g−1) and specific activity (11.8 A m−2) for the MOR, respectively.
Co-reporter:Yifan Chen;Gengtao Fu;Yueyang Li;Quanshu Gu;Lin Xu;Dongmei Sun;Yawen Tang
Journal of Materials Chemistry A 2017 vol. 5(Issue 8) pp:3774-3779
Publication Date(Web):2017/02/21
DOI:10.1039/C6TA09451A
A novel PtPd@Pt core/satellite nanoassemblies with a PtPd bimetallic core and a dendritic Pt shell was fabricated via a simple yet efficient L-glutamic acid derived self-assembly method. The obtained PtPd@Pt nanoassemblies exhibit the reinforced catalytic performance in the aspect of activity and stability for the oxygen reduction reaction relative to the commercial Pt black.
Co-reporter:Gengtao Fu, Zhiming Cui, Yifan Chen, Lin Xu, Yawen Tang, John B. Goodenough
Nano Energy 2017 Volume 39(Volume 39) pp:
Publication Date(Web):1 September 2017
DOI:10.1016/j.nanoen.2017.06.029
•A novel self-assembly strategy for the synthesis of 3D hierarchically mesoporous Ni3FeN microspheres is developed.•Ni3FeN exhibits bifunctional activity for both oxygen evolution and reduction reactions.•Ni3FeN is used as an air-cathode material for Zn-air battery for the first time.•Intrinsic metallic properties, highly stability and unique architecture are responsible for the improved performances.Rechargeable Zn-air battery is largely limited by the lack of low-cost and highly efficient bifunctional oxygen catalysts for both oxygen evolution and reduction reactions (OER and ORR). Herein, we report a promising bifunctional electrocatalyst, mesoporous nickel-iron nitride (Ni3FeN), which was synthesized by thermal ammonalysis of hierarchal NiFe layered double hydroxide microspheres. Different from the widely studied carbon/oxide composite catalysts, this metallic nitride does not need carbon as a conducting support, thus avoiding the issue of carbon corrosion at high potentials. The catalysts provide outstanding bifunctional performance with a low overpotential (0.355 V) at 10 mA cm−2, a low Tafel slope (70 mV dec−1) for OER, and a positive half-wave potential (0.78 V) for ORR under alkaline solution. More importantly, it delivers a lower voltage gap between charge and discharge and a better stability over 300 cycles compared to that of the more costly RuO2 air-cathode.We report a novel bimetallic nickel–iron nitride (Ni3FeN) catalyst with hierarchically mesoporous structure that exhibits excellent electrocatalytic activity and stability for both the oxygen-evolution reaction (OER) and oxygen-reduction reaction (ORR) under alkaline conditions. It delivers a relatively lower voltage between charge and discharge and a better stability over 300 cycles compared to the more costly RuO2 air cathode.Download high-res image (333KB)Download full-size image
Co-reporter:Gengtao Fu, Yifan Chen, Zhiming Cui, Yutao Li, Weidong Zhou, Sen Xin, Yawen Tang, and John B. Goodenough
Nano Letters 2016 Volume 16(Issue 10) pp:6516-6522
Publication Date(Web):September 6, 2016
DOI:10.1021/acs.nanolett.6b03133
The commercialization of Zn–air batteries has been impeded by the lack of low-cost, highly active, and durable catalysts that act independently for oxygen electrochemical reduction and evolution. Here, we demonstrate excellent performance of NiCo nanoparticles anchored on porous fibrous carbon aerogels (NiCo/PFC aerogels) as bifunctional catalysts toward the Zn–air battery. This material is designed and synthesized by a novel K2Ni(CN)4/K3Co(CN)6-chitosan hydrogel-derived method. The outstanding performance of NiCo/PFC aerogels is confirmed as a superior air-cathode catalyst for a rechargeable Zn–air battery. At a discharge–charge current density of 10 mA cm–2, the NiCo/PFC aerogels enable a Zn–air battery to cycle steadily up to 300 cycles for 600 h with only a small increase in the round-trip overpotential, notably outperforming the more costly Pt/C+IrO2 mixture catalysts (60 cycles for 120 h). With the simplicity of the synthetic method and the outstanding electrocatalytic performance, the NiCo/PFC aerogels are promising electrocatalysts for Zn–air batteries.Keywords: bifunctional electrocatalyst; fibrous carbon aerogels; K2Ni(CN)4/K3Co(CN)6-chitosan hydrogel; NiCo alloy; Zn−air battery;
Co-reporter:Gengtao Fu, Xiaoxiao Yan, Zhiming Cui, Dongmei Sun, Lin Xu, Yawen Tang, John B. Goodenough and Jong-Min Lee
Chemical Science 2016 vol. 7(Issue 8) pp:5414-5420
Publication Date(Web):
DOI:10.1039/C6SC01501H
Co-reporter:Xian Jiang, Xiaoxiao Yan, Wangyu Ren, Yufeng Jia, Jianian Chen, Dongmei Sun, Lin Xu, and Yawen Tang
ACS Applied Materials & Interfaces 2016 Volume 8(Issue 45) pp:31076
Publication Date(Web):October 27, 2016
DOI:10.1021/acsami.6b11895
For direct formic acid fuel cells (DFAFCs), the dehydrogenation pathway is a desired reaction pathway, to boost the overall cell efficiency. Elaborate composition tuning and nanostructure engineering provide two promising strategies to design efficient electrocatalysts for DFAFCs. Herein, we present a facile synthesis of porous AgPt bimetallic nanooctahedra with enriched Pt surface (denoted as AgPt@Pt nanooctahedra) by a selective etching strategy. The smart integration of geometric and electronic effect confers a substantial enhancement of desired dehydrogenation pathway as well as electro-oxidation activity for the formic acid oxidation reaction (FAOR). We anticipate that the obtained nanocatalyst may hold great promises in fuel cell devices, and furthermore, the facile synthetic strategy demonstrated here can be extendable for the fabrication of other multicomponent nanoalloys with desirable morphologies and enhanced electrocatalytic performances.Keywords: alloy; dehydrogenation pathway; electrocatalysts; formic acid oxidation reaction; porous nanooctahedra
Co-reporter:Xiaoyu Qiu, Yuxuan Dai, Xiaoshu Zhu, Hanyue Zhang, Ping Wu, Yawen Tang, Shaohua Wei
Journal of Power Sources 2016 Volume 302() pp:195-201
Publication Date(Web):20 January 2016
DOI:10.1016/j.jpowsour.2015.10.065
•Facile template-engaged synthesis of Pt–Pd HPNSs via layer-by-layer assembly.•Unique compositional and structural features of hollow porous Pt–Pd catalyst.•Markedly enhanced electrocatalytic performances toward methanol oxidation reaction.Hollow porous structures of Pt–Pd bimetallic alloy possess unique compositional and structural superiorities for catalytic and electrocatalytic applications, and are thus anticipated to manifest novel properties and/or enhanced performance compared with their monometallic counterparts. Herein, a general electrostatic-attraction-directed layer-by-layer assembly approach has been developed for the construction of a novel type of hollow porous Pt–Pd alloy nanospheres (Pt–Pd HPNSs) using SiO2 nanospheres as templates. Moreover, the Pt–Pd HPNSs with controllable shell thickness are prepared and their comparative electrocatalytic performances toward methanol oxidation reaction (MOR) are investigated. It's found that optimized Pt–Pd HPNSs manifests markedly enhanced catalytic activity and durability in comparison with both commercial Pt black and Pd black catalysts.
Co-reporter:Liping Wu, Zhenyuan Liu, Ming Xu, Jin Zhang, Xiaoyu Yang, Yundi Huang, Jun Lin, Dongmei Sun, Lin Xu, Yawen Tang
International Journal of Hydrogen Energy 2016 Volume 41(Issue 16) pp:6805-6813
Publication Date(Web):4 May 2016
DOI:10.1016/j.ijhydene.2016.03.080
•Uniform ultrathin Pd–Pt alloy nanowires have been synthesized by a facile one-pot hydrothermal approach.•The judicious adoption of NaI and F127 is crucial for the formation of Pd–Pt nanowires by manipulating the reaction kinetics.•The obtained Pd–Pt nanowires exhibit remarkable catalytic performance toward ORR with high activity and durability.•The facile synthesis method can be extendable for the preparations of other 1D alloy nanostructures.The exploration of efficient nanocatalysts with high activity and stability toward the oxygen reduction reaction (ORR) is extremely important for the advancement of fuel cells but still remains challenging. The capability of rational synthesis of one-dimensional ultrathin Pt-based nanowires could effectively address this issue. Herein, we demonstrate a facile one-pot hydrothermal synthesis of uniform ultrathin Pd–Pt alloy nanowires with a high yield. The judicious adoption of NaI as a structure-directing agent and Pluronic F127 as a stabilizing agent is crucial for the formation of the ultrathin Pd–Pt nanowires by manipulating the reaction kinetics. Due to the bimetallic synergetic effect and unique structural advantage, the as-prepared Pd–Pt alloy ultrathin nanowires outperform commercial Pd black and Pt black catalysts toward ORR, with much improved activity and stability. We expect that this work will provide a promising strategy for the development of efficient ORR electrocatalysts and can also be extendable for the preparation of other one-dimensional bimetallic nanostructures.In this manuscript, we demonstrate a facile one-pot hydrothermal synthesis of uniform ultrathin Pd–Pt alloy nanowires with a high yield. Due to the bimetallic synergetic effect and unique structural advantage, the as-prepared Pd–Pt alloy ultrathin nanowires outperform commercial Pd black and Pt black catalysts toward the ORR, with much improved activity and stability.
Co-reporter:Gengtao Fu;Huimin Liu;Nika You;Jiayan Wu;Dongmei Sun;Lin Xu
Nano Research 2016 Volume 9( Issue 3) pp:755-765
Publication Date(Web):2016 March
DOI:10.1007/s12274-015-0954-0
Novel self-assembled architectures have received a growing amount of attention and have significant potential for application in catalysis/electrocatalysis. Herein, we take advantage of the unique coordination and self-assembly properties of arginine for the preparation of dendritic PtCu bimetallic nanoassemblies with tunable chemical composition and structure. Strong interactions between the arginine molecules are key in driving the self-assembly of primary nanocrystals. In addition, the strong coordination interactions between arginine and metal ions is responsible for the formation of Pt–Cu alloys. We also investigated the electrocatalytic activity of various dendritic PtCu bimetallic nanoassemblies towards the methanol oxidation reaction. Pt3Cu1 nanoassemblies exhibited excellent electrocatalytic activity and stability in comparison with other PtCu bimetallic nanoassemblies (Pt1Cu3, Pt1Cu1) and commercial Pt black, due to their unique dendritic structures and the synergistic effect between the Pt and Cu atoms.
Co-reporter:Gengtao Fu, Mingxing Gong, Yawen Tang, Lin Xu, Dongmei Sun and Jong-Min Lee
Journal of Materials Chemistry A 2015 vol. 3(Issue 44) pp:21995-21999
Publication Date(Web):20 Oct 2015
DOI:10.1039/C5TA07188G
This work proposes an effective and facile synthesis strategy for the direct preparation of high-quality Pd nanostructures with well-defined morphologies, such as porous nanobowls, nanocages, and solid nanoparticles. Hollow-structured mesoporous nanostructures endow Pd nanobowls with the best catalytic performance towards the methanol oxidation reaction, demonstrating that the porous Pd nanobowls are indeed promising electrocatalysts for practical application.
Co-reporter:Mingxing Gong, Zhigang Yao, Fayan Lai, Yu Chen, Yawen Tang
Carbon 2015 Volume 91() pp:338-345
Publication Date(Web):September 2015
DOI:10.1016/j.carbon.2015.05.006
The graphene supported precious metal nanocrystal composites have attracted tremendous attention in the field of catalysis/electrocatalysis. In this work, we demonstrate a facile co-chemical reduction approach for the synthesis of the reduced graphene oxide (RGO) supported Pt–Cu alloy nanocrystal (Pt–Cu/RGO) composites. The electrostatic interaction between graphene oxide (GO) and polyallylamine-metal complex plays a critical role in determining the dispersibility of the Pt–Cu nanocrystals on the RGO surface. Various physical characterizations show the bimetallic Pt–Cu nanocrystals are highly alloying, and monodispersed Pt–Cu alloy nanocrystals with 6 nm size are uniformly distributed on the RGO surface. Electrochemical measurements show the as-prepared Pt–Cu/RGO composites have superior electrocatalytic activity and stability towards the ethanol oxidation reaction compared to commercial Pt/C electrocatalyst.
Co-reporter:Ming-Xing Gong, Xian Jiang, Tie-Ying Xue, Tian-Yi Shen, Lin Xu, Dong-Mei Sun and Ya-Wen Tang
Catalysis Science & Technology 2015 vol. 5(Issue 12) pp:5105-5109
Publication Date(Web):15 Oct 2015
DOI:10.1039/C5CY01603G
Ternary PtPdCu alloy concave nanooctahedra (ACNOs) are synthesized by a facile “one-pot, two-step” method from PtCu nanodendrites. The as-prepared PtPdCu ACNOs show superior electrocatalytic activity and durability for the methanol oxidation reaction (MOR) compared with binary PtCu alloy nanodendrites and commercial Pt black.
Co-reporter:Xiaoyu Qiu;Ping Wu;Lin Xu;Yawen Tang;Jong-Min Lee
Advanced Materials Interfaces 2015 Volume 2( Issue 18) pp:
Publication Date(Web):
DOI:10.1002/admi.201500321
Graphene has served widely as a support material for noble metal nanoparticle electrocatalysts in fuel cells. During the synthesis of electrocatalysts, however, the intense stacking and folding of graphene nanosheets decreases the utilization and activity of electrocatalysts, owing to the following aspects: i) the noble metal wrapped by the winding graphene cannot be fully utilized; ii) the structural destruction of graphene decreases the specific surface area and increases electrical resistance; and iii) the hydrophobicity and wrinkles of graphene greatly increase the mass transfer resistance of fuel molecules and electrolytes. In this work, 3D graphene oxide hollow nanospheres are designed to minimize wrinkles, maximize specific surface area, and realize the regular clipping of 2D graphene oxide. The 3D-reduced graphene oxide hollow nanosphere supported Pd-network nanohybrids (3D-RGO/Pd-NWs) are then obtained using 3D graphene oxide hollow nanospheres as a reaction precursor. The skeleton of 3D-RGO not only acts as an exclusive inner conducting shell to promote electron and ion kinetics but is also crucial for enhancing the permeation of fuel molecules and electrolytes. Therefore, 3D-RGO/Pd-NWs exhibit enhanced electrocatalytic activity and durability for the formic oxidation reaction in an acidic medium compared to 2D graphene supported Pd nanoparticles and commercial Pd/C electrocatalysts.
Co-reporter:Geng-Tao Fu, Rui Wu, Chang Liu, Jun Lin, Dong-Mei Sun and Ya-Wen Tang
RSC Advances 2015 vol. 5(Issue 23) pp:18111-18115
Publication Date(Web):02 Feb 2015
DOI:10.1039/C5RA01009H
We report a one-pot hydrothermal route for the successful preparation of three-dimensional (3D) Pd nanochain networks by an arginine-assisted self-assembly process, which show higher electrocatalytic activity and stability than commercial Pd black for the borohydride oxidation reaction due to the unique 3D network structure.
Co-reporter:Ke Wu, Qian Zhang, Dongmei Sun, Xiaoshu Zhu, Yu Chen, Tianhong Lu, Yawen Tang
International Journal of Hydrogen Energy 2015 Volume 40(Issue 20) pp:6530-6537
Publication Date(Web):1 June 2015
DOI:10.1016/j.ijhydene.2015.03.115
•In situ growth of Pd–Pt alloy nanoflowers on reduced graphene oxide is developed.•One-pot polyallylamine hydrochloride-assisted co–chemical reduction is applied.•The supported hybrid nanocatalysts exhibit enhanced performance for methanol oxidation.•Proposed protocol gives insight to design of in situ growth of supported catalysts.In situ growth of Pd–Pt alloy nanoflowers on host reduced graphene oxide (Pd–Pt ANFs/RGO) nanosheets by one–pot polyallylamine hydrochloride-assisted co–chemical reduction method, is developed. Compared with the common approaches to assembly of nanocatalysts in selected substrates based on pre-synthesized catalyst nanoparticles, the in situ fabrication is more facile, cost-effective and environment-friendly, allowing effective control of the location, distribution and uniformity of the supported Pd–Pt nanoflowers through the entire matrix. The detailed morphology, composition and structure of Pd–Pt ANFs/RGO nanocomposites are investigated by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), selected-area electron diffraction (SAED), energy dispersive spectrum (EDS), and nitrogen adsorption–desorption isotherms (SADI). TEM images show that Pd–Pt ANFs are directly grown on RGO with porous structure and good dispersion. Against commercial Pd/C catalyst, Pd–Pt ANFs/RGO nanocomposites show superior electrocatalytic activity, stability and satisfactory CO tolerance towards methanol oxidation reaction in basic electrolyte.Evenly-spread porous Pd–Pt alloy nanoflowers on reduced graphene oxide nanosheets, in situ grown by one-pot polyallylamine hydrochloride-assisted co–chemical reduction method, display markedly enhanced electrocatalytic activity for methanol oxidation towards DMFCs applications.
Co-reporter:Ruopeng Zhao, Gengtao Fu, Tongge Zhou, Yu Chen, Xiaoshu Zhu, Yawen Tang and Tianhong Lu
Nanoscale 2014 vol. 6(Issue 5) pp:2776-2781
Publication Date(Web):19 Dec 2013
DOI:10.1039/C3NR05718F
Highly branched noble metal nanostructures are highly attractive for catalytic applications owing to their specific physical and chemical properties. In this work, three-dimensional highly branched palladium tetrapods (Pd-THBTs) have been constructed in the presence of polyvinylpyrrolidone (PVP) through one-step hydrothermal reduction of ethylenediamine-tetramethylene phosphonate–palladium(II) (EDTMP–PdII) by formaldehyde. The morphology and structure of the Pd-THBTs were fully characterized and the growth mechanism was explored and discussed based on the experimental observation. The concave Pd tetrahedra grew into highly branched Pd tetrapods consisting of four nanothorn-like branches with tetrahedral dimensions through interesting multi-generation nanocrystal overgrowth. The electrocatalytic activities of the as-synthesized Pd-THBTs toward formic acid oxidation were also studied by cyclic voltammetry and chronoamperometry. The Pd-THBTs showed higher catalytic activity and stability for formic acid oxidation than the commercial Pd black.
Co-reporter:Geng-tao Fu, Chang Liu, Rui Wu, Yu Chen, Xiao-shu Zhu, Dong-mei Sun, Ya-wen Tang and Tian-hong Lu
Journal of Materials Chemistry A 2014 vol. 2(Issue 42) pp:17883-17888
Publication Date(Web):02 Sep 2014
DOI:10.1039/C4TA03601H
Well-defined platinum nanocrystals with a cuboid-like shape (Pt nanocuboids) were synthesized in high yields by the simple hydrothermal reduction of Pt(II) precursors with formaldehyde (HCHO) solution in the presence of L-lysine and polyvinyl pyrrolidone (PVP). The influential effects of several important experimental parameters on the shape of Pt nanocrystals were systematically investigated, demonstrating that L-lysine and oxidative etching were critical to the morphological control and evolution of Pt nanocuboids. Due to the unique orientation and size effects, the as-prepared Pt nanocuboids exhibited significantly enhanced catalytic activity and stability towards the ammonia oxidation reaction (AOR) in comparison with commercial Pt black catalysts.
Co-reporter:Xin-Yu Liu, Ying Zhang, Ming-Xing Gong, Ya-Wen Tang, Tian-Hong Lu, Yu Chen and Jong-Min Lee
Journal of Materials Chemistry A 2014 vol. 2(Issue 34) pp:13840-13844
Publication Date(Web):09 Jul 2014
DOI:10.1039/C4TA02522A
By using the K2PdCl4/K2Pt(CN)4 cyanogel with a three-dimensional (3D) backbone structure as a reaction precursor, corallite-like Pt–Pd alloy nanostructures (Pt–Pd CANs) are facilely obtained by a simple NaBH4 reduction method; these exhibit superior electrocatalytic activity and stability for the ethanol oxidation reaction (EOR).
Co-reporter:Lu Zhang, Dingkun Lu, Yu Chen, Yawen Tang and Tianhong Lu
Journal of Materials Chemistry A 2014 vol. 2(Issue 5) pp:1252-1256
Publication Date(Web):11 Nov 2013
DOI:10.1039/C3TA13784H
Porous ternary Pd–Co–P alloy network nanostructures were synthesized by reducing K2PdCl4/K3Co(CN)6 cyanogel with a mixture of NaH2PO2 and NaBH4 at room temperature, which show superior electrocatalytic activity and stability towards hydrazine oxidation reaction.
Co-reporter:Ruopeng Zhao, Yi Liu, Chang Liu, Guangrui Xu, Yu Chen, Yawen Tang and Tianhong Lu
Journal of Materials Chemistry A 2014 vol. 2(Issue 48) pp:20855-20860
Publication Date(Web):03 Oct 2014
DOI:10.1039/C4TA04917A
Enhancing the electrocatalytic activity and stability of cathodic Pt electrocatalysts in proton exchange membrane fuel cells is an attractive research topic because of the importance of the oxygen reduction reaction (ORR) in PEMFCs. In this work, Pd@Pt core–shell tetrapods (CSNTPs) are prepared by a facile seeded growth process. During the synthesis, Pd tetrapods act as seeds to guide the growth of the dendritic Pt shell. Various physical techniques confirm that the as-prepared Pd@Pt CSNTPs have a core–shell structure and surface dendritic morphology. Moreover, the electrocatalytic activity and durability of the Pd@Pt CSNTPs for the ORR in acidic media were systemically studied by various electrochemical techniques such as cyclic voltammetry, ORR polarization measurements, and accelerated durability test (ADT). After an 8000 cycle ADT, Pd@Pt CSNTPs only lose 13% of their initial electrochemical surface area, whereas commercial Pt black loses 78%. Compared to Pt black, Pd@Pt CSNTPs show remarkably enhanced electrocatalytic activity and durability for the ORR owing to their specific structural characteristics and the synergistic effect between the Pt shell and Pd core.
Co-reporter:Mingxing Gong, Gengtao Fu, Yu Chen, Yawen Tang, and Tianhong Lu
ACS Applied Materials & Interfaces 2014 Volume 6(Issue 10) pp:7301
Publication Date(Web):May 6, 2014
DOI:10.1021/am500656j
The controllable synthesis of noble metal alloy nanostructures with highly branched morphology has attracted much attention because of their specific physical and chemical properties. This article reports the synthesis of platinum–copper bimetallic alloy nanodendrites (Pt–Cu BANDs) by a facile, one-pot, templateless, and seedless hydrothermal method in the presence of poly(allylamine hydrochloride) (PAH) and formaldehyde (HCHO). The morphology, composition, and structure of Pt–Cu BANDs are fully characterized by various physical techniques, demonstrating Pt–Cu BANDs are highly alloying, porous, and self-supported nanostructures. The formation/growth mechanism of Pt–Cu BANDs is explored and discussed based on the experimental observations. The autocatalytic growth and interdiffusion are responsible for the formation of Pt–Cu alloy whereas selective oxidative etching results in dendritic morphology of Pt–Cu alloy nanostructures. In addition, the electrocatalytic activity and stability of Pt–Cu BANDs for the methanol oxidation reaction (MOR) are investigated by various electrochemical techniques. The synthesized Pt–Cu BANDs show higher electrocatalytic activity and stability than commercially available Pt black.Keywords: electrocatalytic activity; methanol oxidation reaction; nanodendrites; platinum−copper alloy; polyallylamine;
Co-reporter:Geng-Tao Fu, Xian Jiang, Rui Wu, Shao-Hua Wei, Dong-Mei Sun, Ya-Wen Tang, Tian-Hong Lu, and Yu Chen
ACS Applied Materials & Interfaces 2014 Volume 6(Issue 24) pp:22790
Publication Date(Web):December 3, 2014
DOI:10.1021/am506965f
Noble metallic nanocrystals (NMNCs) with highly branched morphologies are an exciting new class of nanomaterials because of their great potential application in catalysis, sensing, optics, and electronics originating from their unique structures. Herein, we report a facile water-based method to synthesize high-quality palladium (Pd) tetrapods with the assistance of arginine molecule, which is more economical and environmentally friendly than the previous reported carbon monoxide (CO)-assisted synthesis in the organic system. During the synthesis, arginine molecule plays an essential role in controlling the tetrapod-like morphology. The as-synthesized Pd tetrapods have a potential application in the formic acid (HCOOH)-induced reduction of highly toxic hexavalent chromium (Cr(VI)) owing to their improved catalytic performance for the HCOOH decomposition.Keywords: arginine; Cr(VI) reduction; decomposition; formic acid; palladium tetrapods
Co-reporter:Yi Shi, Shengkang Yin, Yanrong Ma, Dingkun Lu, Yu Chen, Yawen Tang, Tianhong Lu
Journal of Power Sources 2014 Volume 246() pp:356-360
Publication Date(Web):15 January 2014
DOI:10.1016/j.jpowsour.2013.07.099
•Monodisperse oleylamine-stablized Pd nanoparticles (Pd–OAm) are synthesized.•Low cost Pd(Ac)2 is a promising precursor for Pd nanoparticles synthesis.•Pd–OAm shows superior electrocatalytic activity for the ORR.•Pd–OAm possesses excellent formic acid-tolerant ability.The oleylamine (OAm)-functionalized Pd nanoparticles (Pd–OAm) have been conveniently synthesized through direct thermal decomposition method of low cost palladium acetate. The morphology, crystalline structure and composition of the Pd–OAm are investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Fourier transform infrared (FT-IR) spectroscopy, XPS and zeta potential analysis confirm the successful immobilization of OAm molecules on the Pd nanoparticles surface. The Pd–OAm displays an enhanced electrocatalytic activity and formic acid-tolerant ability for the oxygen reduction reaction (ORR), suggesting a potential application in cathodic catalyst for direct formic acid fuel cells.Oleylamine (OAm)-functionalized palladium nanoparticles showed an enhanced electrocatalytic activity and formic acid tolerance for the oxygen reduction reaction.
Co-reporter:Zhenyuan Liu, Gengtao Fu, Yawen Tang, Dongmei Sun, Yu Chen and Tianhong Lu
CrystEngComm 2014 vol. 16(Issue 36) pp:8576-8581
Publication Date(Web):24 Jun 2014
DOI:10.1039/C4CE00933A
Gold nanocrystals (Au NCs), with a specific three dimensional (3D) dendritic structure, usually possess special properties which always attract considerable attention. Herein, novel dendritic Au nanocorals were prepared using an effective and facile one-pot strategy with polyallylamine hydrochloride (PAH) as a capping and shape control agent, and ascorbic acid (AA) as a reductant. The formation mechanism was investigated using time sequential evolution experiments, and the coral-like nanostructures originated from the aggregation and growth mechanism. Additionally, the prepared Au nanocorals showed excellent electrocatalytic activity and stability for the ethanol oxidation reaction (EOR), which could be attributed to the specific 3D dendritic structure and the significant change in the electronic structure of the Au atom.
Co-reporter:Xiaoyu Qiu, Ruopeng Zhao, Yanan Li, Yawen Tang, Dongmei Sun, Shaohua Wei and Tianhong Lu
RSC Advances 2014 vol. 4(Issue 100) pp:57144-57147
Publication Date(Web):27 Oct 2014
DOI:10.1039/C4RA11808A
Bimetallic Pd1Cu3 multipod nanocrystals (Pd1Cu3-MNCs) are synthesized by a facile hydrothermal method. The catalytic reduction of CuII by Pd crystal nuclei is critical for the formation of Pd1Cu3-MNCs. Pd1Cu3-MNCs show remarkably enhanced catalytic activity for the hydrogenation reduction of nitro functional groups compared to the commercial Pd black.
Co-reporter:Gengtao Fu;Zhenyuan Liu;Yu Chen;Jun Lin;Yawen Tang;Tianhong Lu
Nano Research 2014 Volume 7( Issue 8) pp:1205-1214
Publication Date(Web):2014 August
DOI:10.1007/s12274-014-0483-2
Co-reporter:Lu Zhang, Qi Sui, Tingting Tang, Yu Chen, Yiming Zhou, Yawen Tang, Tianhong Lu
Electrochemistry Communications 2013 Volume 32() pp:43-46
Publication Date(Web):July 2013
DOI:10.1016/j.elecom.2013.03.041
•Pd nanodendrite assemblies (Pd-NDAs) are obtained by a cyanogel-reduction route.•The BET surface area of the Pd-NDAs is measured to be 90.1 m2 g− 1.•Pd-NDAs exhibit enhanced activity and stability for the formic acid oxidation.Well-defined Pd nanodendrite assemblies (Pd-NDAs) with high surface area are successfully synthesized through a facile cyanogel-reduction route in the absence of surfactant. The detailed morphology, composition and structure of the Pd-NDAs are thoroughly investigated by various characterization methods, demonstrating that the Pd-NDAs are highly porous and self-supported structures. Cyclic voltammetry, CO-stripping and chronoamperometry tests show that the Pd-NDAs exhibit superior electrocatalytic activity and stability for the formic acid oxidation under acidic conditions, which make them promising anodic electrocatalysts for the future.Well-defined Pd nanodendrite assemblies with big surface area and high electrocatalytic activity were fabricated though simple cyanogel-reduction method.
Co-reporter:Jiangfeng Xu, Xinyu Liu, Yu Chen, Yiming Zhou, Tianhong Lu and Yawen Tang
Journal of Materials Chemistry A 2012 vol. 22(Issue 44) pp:23659-23667
Publication Date(Web):09 Oct 2012
DOI:10.1039/C2JM35649J
Three-dimensional (3D) platinum–cobalt alloy networks nanostructures with a high alloying degree were synthesized through a room temperature wet-chemical synthetic method using the K2PtCl4/K3Co(CN)6 cyanogel as reaction precursor in the absence of surfactants and templates. The size, morphology and surface composition of platinum–cobalt alloy networks nanostructures were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectrum (EDS), selected area electron diffraction (SAED), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The 3D backbone structure and double-metallic property of the K2PtCl4/K3Co(CN)6 cyanogel are responsible for the 3D structure and the high alloying degree of the as-prepared products, respectively. Compared to the pure Pt nanoparticles, 3D platinum–cobalt alloy networks nanostructures exhibit superior electrocatalytic activity and stability for the methanol oxidation reaction (MOR), which is ascribed to their unique 3D structure and alloy properties.
Co-reporter:Hanjun Sun, Jiangfeng Xu, Gengtao Fu, Xinbiao Mao, Lu Zhang, Yu Chen, Yiming Zhou, Tianhong Lu, Yawen Tang
Electrochimica Acta 2012 Volume 59() pp:279-283
Publication Date(Web):1 January 2012
DOI:10.1016/j.electacta.2011.10.092
Highly dispersed and ultrafine palladium–phosphorus (Pd–P) nanoparticles (NPs) are prepared with a novel phosphorus reduction method. The structural and electronic properties of Pd–P NPs are characterized using Fourier transform infrared (FT-IR), energy dispersive spectrometer (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The electrooxidation of formic acid on Pd–P NPs are investigated by using cyclic voltammetry, chronoamperometry and CO-stripping measurements. The physical characterizations indicate the doped P element can enhance the content of Pd0 species in Pd NPs, decrease the particle size and improve the dispersion of Pd–P NPs. The electrochemical measurements show the Pd–P NPs have a better catalytic performance for formic acid electrooxidation than Pd NPs.
Co-reporter:Yu Pan, Fan Zhang, Ke Wu, Zhaoyang Lu, Yu Chen, Yiming Zhou, Yawen Tang, Tianhong Lu
International Journal of Hydrogen Energy 2012 Volume 37(Issue 4) pp:2993-3000
Publication Date(Web):February 2012
DOI:10.1016/j.ijhydene.2011.11.042
Carbon supported Palladium–Iron bimetallic nanoparticles (Pd–Fe/C) electrocatalyst is synthesized by the direct thermal decomposition method of nontoxic metallic acetate salt. During the preparation of the Pd–Fe/C electrocatalyst, the tedious wash post-treatment of electrocatalyst is effectively avoided due to non-existence of inorganic anion. The physico-chemical properties of the Pd–Fe/C electrocatalyst are characterized by X-ray diffraction analysis (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). These structural analyses reveal that the Pd–Fe/C electrocatalyst possesses the high alloying degree and the small particle size. Electrochemical data indicate that the eletrocatalytic activity of the Pd–Fe/C electrocatalyst for oxygen reduction reaction (ORR) is much higher than that of Pd/C electrocatalyst, which originates from the synergistic effect between Pd atom and Fe atom.Carbon supported Pd–Fe bimetallic nanoparticles with relatively small particle size were prepared by a direct thermal decomposition method of metallic acetate salt. HRTEM images show no obvious lattice fringe is found in Pd–Fe nanoparticles, indicating Fe atom has entered into the Pd crystal lattice and form a single-phase fcc disordered alloyed structure (solid solution).Highlights► A novel direct thermal decomposition method is used to prepare Pd–Fe/C bimetallic electrocatalyst. ► The tedious wash post-treatment of electrocatalyst is effectively avoided due to non-existence of inorganic anion. ► The resulting Pd–Fe/C electrocatalyst shows an excellent electrocatalytic activity for the ORR.
Co-reporter:Guojie Zhang;Lu Zhang;Liping Shen;Dr. Yu Chen;Yiming Zhou;Dr. Yawen Tang;Tianhong Lu
ChemPlusChem 2012 Volume 77( Issue 10) pp:936-940
Publication Date(Web):
DOI:10.1002/cplu.201200163
Abstract
An inorganic polymeric hydrogel, which is formed irreversibly in water through interaction between K2PdIICl4 and K4FeII(CN)6, is synthesized. The palladium nanostructures take the form of three-dimensional (3D) networks and are obtained in a facile manner by simple reduction of the hydrogel using NaBH4. The size, morphology, and surface composition of these 3D palladium networks are investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive spectroscopy (EDS), selected-area electron diffraction (SAED), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The electrochemical properties are investigated in detail by cyclic voltammetry, chronoamperometry, and CO stripping tests. Such 3D nanostructures exhibit a large electroactive surface area, excellent electrochemical stability, and high electrocatalytic activity toward electrooxidation of formic acid.
Co-reporter:Jiangfeng Xu, Xingyu Wu, Gengtao Fu, Xinyu Liu, Yu Chen, Yiming Zhou, Yawen Tang, Tianhong Lu
Electrochimica Acta 2012 80() pp: 233-239
Publication Date(Web):
DOI:10.1016/j.electacta.2012.07.005
Co-reporter:Juan Ma, Hanjun Sun, Fu Su, Yu Chen, Yawen Tang, Tianhong Lu, Junwei Zheng
International Journal of Hydrogen Energy 2011 Volume 36(Issue 12) pp:7265-7274
Publication Date(Web):June 2011
DOI:10.1016/j.ijhydene.2011.02.142
A novel self-reduction of Pt-complex method is used to prepare Vulcan XC-72 carbon-supported Pt nanoparticles (Pt/C) catalysts by employing ethylenediamine-tetramethylene phosphonic acid (EDTMP) as a complexing reagent. During the preparation of Pt/C catalysts, the particle size of Pt nanoparticles (Pt–NPs) can be controlled effectively in the range of 1.7–13.5 nm by adjusting reaction solution pH values. TEM images demonstrate that the Pt–NPs well disperse on the Vulcan XC-72 carbon support with a relatively narrow particle size distribution by using the complex self-reduction method. Therefore, the Pt/C catalysts prepared by the same method are suitable for evaluating the size effect of the Pt–NPs on electrocatalytic performance for ethanol electrooxidation. A correlation between the electrocatalytic activity of ethanol oxidation and particle size of the Pt/C catalysts indicates that Pt–NPs with mean particle size of ca. 2.5 nm possesses the highest electrocatalytic performance for ethanol electrooxidation.
Co-reporter:Fan Zhang, Yue Zhou, Yu Chen, Zhongwen Shi, Yawen Tang, Tianhong Lu
Journal of Colloid and Interface Science 2010 Volume 351(Issue 2) pp:421-426
Publication Date(Web):15 November 2010
DOI:10.1016/j.jcis.2010.07.063
In the preparation and storage of gold nanoparticles (Au-NPs) in colloidal form, the stability of the colloid is of utmost importance. We report a novel strategy for the synthesis of the phosphonic acid-functionalized gold nanoparticles (Au-NPs) with the high colloid stability by using ethylenediamine-tetramethylene phosphonic acid (EDTMP) as the reducing agent and its oxidation product as the stabilizing agent. The resultant phosphonic acid-functionalized Au-NPs show a remarkable colloidal stability, which likely arises from strong electrostatic effect of negatively charged phosphonate groups and the extremely hydrophilic property of phosphonate groups. Through the present method, the scope of reducing and stabilizing agents for preparation of phosphonic acid-functionalized Au-NPs extend from the PO3H2-terminated thiols to the aminopolyphosphonates.Graphical abstractThe phosphonic acid-functionalized gold nanoparticles (Au-NPs) with the high colloid stability was synthesized by using ethylenediamine-tetramethylene phosphonic acid as the reducing agent and its oxidation product as the stabilizing agent.Research highlights► The phosphonic acid-functionalized gold nanoparticles possess high colloid stability. ► EDTMP is used as the reducing agent and its oxidation product act as the stabilizing agent. ► The particle size can be controlled by simple adjusting the feeding ratio of EDTMP/Au.
Co-reporter:Yu Chen, Guojie Zhang, Juan Ma, Yiming Zhou, Yawen Tang, Tianhong Lu
International Journal of Hydrogen Energy 2010 Volume 35(Issue 19) pp:10109-10117
Publication Date(Web):October 2010
DOI:10.1016/j.ijhydene.2010.07.170
Single-wall carbon nano-tubes (SWNTs), multi-wall carbon nano-tubes (MWNTs) and Vulcan XC-72 carbon (XC-72) are used as supporting carbon materials to prepare Pt/XC-72, Pt/SWNTs and Pt/MWNTs catalysts in tetrahydrofuran/water/ethanol mixture solution. Transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS) measurements demonstrate that the type of supporting carbon material affects significantly the morphology and the electronic structure of supported Pt nano-particles (NPs). Electrochemical measurements indicate that the Pt/SWNTs catalyst exhibited the highest current density, the lowest onset oxidation potential and the best stability for methanol electro-oxidation among the three samples, indicating SWNTs are an ideal anode catalyst supporting material for the practical application of direct methanol fuel cells.
Co-reporter:Yawen Tang, Shuang Cao, Yu Chen, Tianhong Lu, Yiming Zhou, Lude Lu, Jianchun Bao
Applied Surface Science 2010 Volume 256(Issue 13) pp:4196-4200
Publication Date(Web):15 April 2010
DOI:10.1016/j.apsusc.2010.01.124
Abstract
The carbon-supported Pd–Fe catalyst (Pd–Fe/C) is prepared in the H2O/tetrahydrofuran (THF) mixture solvent under the low temperature. The homemade Pd–Fe/C catalyst contains two forms of iron species, alloying and non-alloying Fe. The alloying Fe species is hardly dissolved in 0.5 M H2SO4 solution, while the non-alloying Fe species is easily dissolved in 0.5 M H2SO4 solution. The electrochemical measurements show the electrocatalytic activity of the Pd–Fe/C catalyst with the acid treatment for the oxygen reduction is higher than that of the Pd–Fe/C catalyst without the acid treatment, illustrating that the non-alloying Fe species suppresses the electrocatalytic activity of the Pd–Fe/C catalyst. In contrast, the alloying Fe species promotes the electrocatalytic activity of the Pd–Fe/C catalyst for the oxygen reduction, which is likely attributed to the change of the electron structure of Pd atom and/or bond length of Pd–Pd in the Pd–Fe/C catalyst.
Co-reporter:Tongfei Li, Gengtao Fu, Jiahui Su, Yi Wang, Yinjie Lv, Xiuyong Zou, Xiaoshu Zhu, Lin Xu, Dongmei Sun, Yawen Tang
Electrochimica Acta (20 March 2017) Volume 231() pp:
Publication Date(Web):20 March 2017
DOI:10.1016/j.electacta.2017.02.044
•Au-P/C catalyst is synthesized by a facile and novel white-phosphorus reduce method.•AuP particles with ultrafine particle-size are uniformly dispersed on carbon support.•Au-P/C catalyst exhibits much higher content of P0 than reported metal/P catalysts.•Au-P/C catalysts show excellent catalytic properties for ethanol oxidation reaction.Herein, we develop a new kind of carbon supported gold-phosphorus (Au-P/C) electrocatalyst for the alkaline ethanol oxidation reaction (EOR). The Au-P/C catalysts with different Au/P ratio (i.e., AuP/C, Au3P2/C and Au4P3/C) can be obtained by a facile and novel hot-reflux method with white phosphorus (P4) as reductant and ethanol as solvent. The crystal structure, composition and particle-size of the Au-P/C catalysts are investigated by X-ray diffraction (XRD), Energy Dispersive Spectrometer (EDS), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS), etc. The results demonstrate that Au-P/C catalysts present an alloy phase with the high content of P, ultrafine particle-size and high dispersity on carbon support, which results in excellent electrocatalytic activity and stability towards the EOR compared with that of the free-phosphorus Au/C catalyst. In addition, among the various Au-P/C catalysts with different Au/P ratio, the AuP/C sample exhibits the best electrocatalytic performance in comparison with other Au3P2/C and Au4P3/C samples.We develop a new kind of carbon supported gold-phosphorus (Au-P/C) electrocatalyst by a facile and novel phosphorus reduction method, and demonstrate the Au-P/C is a highly active and stable electrocatalyst for the ethanol oxidation reaction.
Co-reporter:Yifan Chen, Gengtao Fu, Yueyang Li, Quanshu Gu, Lin Xu, Dongmei Sun and Yawen Tang
Journal of Materials Chemistry A 2017 - vol. 5(Issue 8) pp:NaN3779-3779
Publication Date(Web):2016/11/22
DOI:10.1039/C6TA09451A
A novel PtPd@Pt core/satellite nanoassemblies with a PtPd bimetallic core and a dendritic Pt shell was fabricated via a simple yet efficient L-glutamic acid derived self-assembly method. The obtained PtPd@Pt nanoassemblies exhibit the reinforced catalytic performance in the aspect of activity and stability for the oxygen reduction reaction relative to the commercial Pt black.
Co-reporter:Ming-Xing Gong, Xian Jiang, Tie-Ying Xue, Tian-Yi Shen, Lin Xu, Dong-Mei Sun and Ya-Wen Tang
Catalysis Science & Technology (2011-Present) 2015 - vol. 5(Issue 12) pp:NaN5109-5109
Publication Date(Web):2015/10/15
DOI:10.1039/C5CY01603G
Ternary PtPdCu alloy concave nanooctahedra (ACNOs) are synthesized by a facile “one-pot, two-step” method from PtCu nanodendrites. The as-prepared PtPdCu ACNOs show superior electrocatalytic activity and durability for the methanol oxidation reaction (MOR) compared with binary PtCu alloy nanodendrites and commercial Pt black.
Co-reporter:Jiangfeng Xu, Xinyu Liu, Yu Chen, Yiming Zhou, Tianhong Lu and Yawen Tang
Journal of Materials Chemistry A 2012 - vol. 22(Issue 44) pp:NaN23667-23667
Publication Date(Web):2012/10/09
DOI:10.1039/C2JM35649J
Three-dimensional (3D) platinum–cobalt alloy networks nanostructures with a high alloying degree were synthesized through a room temperature wet-chemical synthetic method using the K2PtCl4/K3Co(CN)6 cyanogel as reaction precursor in the absence of surfactants and templates. The size, morphology and surface composition of platinum–cobalt alloy networks nanostructures were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectrum (EDS), selected area electron diffraction (SAED), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The 3D backbone structure and double-metallic property of the K2PtCl4/K3Co(CN)6 cyanogel are responsible for the 3D structure and the high alloying degree of the as-prepared products, respectively. Compared to the pure Pt nanoparticles, 3D platinum–cobalt alloy networks nanostructures exhibit superior electrocatalytic activity and stability for the methanol oxidation reaction (MOR), which is ascribed to their unique 3D structure and alloy properties.
Co-reporter:Ruopeng Zhao, Yi Liu, Chang Liu, Guangrui Xu, Yu Chen, Yawen Tang and Tianhong Lu
Journal of Materials Chemistry A 2014 - vol. 2(Issue 48) pp:NaN20860-20860
Publication Date(Web):2014/10/03
DOI:10.1039/C4TA04917A
Enhancing the electrocatalytic activity and stability of cathodic Pt electrocatalysts in proton exchange membrane fuel cells is an attractive research topic because of the importance of the oxygen reduction reaction (ORR) in PEMFCs. In this work, Pd@Pt core–shell tetrapods (CSNTPs) are prepared by a facile seeded growth process. During the synthesis, Pd tetrapods act as seeds to guide the growth of the dendritic Pt shell. Various physical techniques confirm that the as-prepared Pd@Pt CSNTPs have a core–shell structure and surface dendritic morphology. Moreover, the electrocatalytic activity and durability of the Pd@Pt CSNTPs for the ORR in acidic media were systemically studied by various electrochemical techniques such as cyclic voltammetry, ORR polarization measurements, and accelerated durability test (ADT). After an 8000 cycle ADT, Pd@Pt CSNTPs only lose 13% of their initial electrochemical surface area, whereas commercial Pt black loses 78%. Compared to Pt black, Pd@Pt CSNTPs show remarkably enhanced electrocatalytic activity and durability for the ORR owing to their specific structural characteristics and the synergistic effect between the Pt shell and Pd core.
Co-reporter:Geng-tao Fu, Chang Liu, Rui Wu, Yu Chen, Xiao-shu Zhu, Dong-mei Sun, Ya-wen Tang and Tian-hong Lu
Journal of Materials Chemistry A 2014 - vol. 2(Issue 42) pp:NaN17888-17888
Publication Date(Web):2014/09/02
DOI:10.1039/C4TA03601H
Well-defined platinum nanocrystals with a cuboid-like shape (Pt nanocuboids) were synthesized in high yields by the simple hydrothermal reduction of Pt(II) precursors with formaldehyde (HCHO) solution in the presence of L-lysine and polyvinyl pyrrolidone (PVP). The influential effects of several important experimental parameters on the shape of Pt nanocrystals were systematically investigated, demonstrating that L-lysine and oxidative etching were critical to the morphological control and evolution of Pt nanocuboids. Due to the unique orientation and size effects, the as-prepared Pt nanocuboids exhibited significantly enhanced catalytic activity and stability towards the ammonia oxidation reaction (AOR) in comparison with commercial Pt black catalysts.
Co-reporter:Xin-Yu Liu, Ying Zhang, Ming-Xing Gong, Ya-Wen Tang, Tian-Hong Lu, Yu Chen and Jong-Min Lee
Journal of Materials Chemistry A 2014 - vol. 2(Issue 34) pp:NaN13844-13844
Publication Date(Web):2014/07/09
DOI:10.1039/C4TA02522A
By using the K2PdCl4/K2Pt(CN)4 cyanogel with a three-dimensional (3D) backbone structure as a reaction precursor, corallite-like Pt–Pd alloy nanostructures (Pt–Pd CANs) are facilely obtained by a simple NaBH4 reduction method; these exhibit superior electrocatalytic activity and stability for the ethanol oxidation reaction (EOR).
Co-reporter:Lu Zhang, Dingkun Lu, Yu Chen, Yawen Tang and Tianhong Lu
Journal of Materials Chemistry A 2014 - vol. 2(Issue 5) pp:NaN1256-1256
Publication Date(Web):2013/11/11
DOI:10.1039/C3TA13784H
Porous ternary Pd–Co–P alloy network nanostructures were synthesized by reducing K2PdCl4/K3Co(CN)6 cyanogel with a mixture of NaH2PO2 and NaBH4 at room temperature, which show superior electrocatalytic activity and stability towards hydrazine oxidation reaction.
Co-reporter:Gengtao Fu, Mingxing Gong, Yawen Tang, Lin Xu, Dongmei Sun and Jong-Min Lee
Journal of Materials Chemistry A 2015 - vol. 3(Issue 44) pp:NaN21999-21999
Publication Date(Web):2015/10/20
DOI:10.1039/C5TA07188G
This work proposes an effective and facile synthesis strategy for the direct preparation of high-quality Pd nanostructures with well-defined morphologies, such as porous nanobowls, nanocages, and solid nanoparticles. Hollow-structured mesoporous nanostructures endow Pd nanobowls with the best catalytic performance towards the methanol oxidation reaction, demonstrating that the porous Pd nanobowls are indeed promising electrocatalysts for practical application.
Co-reporter:Gengtao Fu, Xiaoxiao Yan, Zhiming Cui, Dongmei Sun, Lin Xu, Yawen Tang, John B. Goodenough and Jong-Min Lee
Chemical Science (2010-Present) 2016 - vol. 7(Issue 8) pp:
Publication Date(Web):
DOI:10.1039/C6SC01501H
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