Co-reporter:Xiang Zhang;Wenqing Zheng;Wenyu Zhao
Journal of Materials Science 2017 Volume 52( Issue 9) pp:5179-5187
Publication Date(Web):23 January 2017
DOI:10.1007/s10853-017-0755-9
Substrate materials are of great significance for the development of pseudocapacitor electrodes. Herein, pseudocapacitive NiCo2O4 have been successfully grown on the 3D graphite felt (GF) substrate via a two-step method, including the prior co-deposition of Ni and Co ions on the GF and succeeding thermal transformation of Ni/Co precursors to spinel NiCo2O4. Porous NiCo2O4 nanosheets are formed on the surface of GF, yielding stand-alone nanocomposite electrodes. The experimental results show that the NiCo2O4/GF electrode achieves a remarkable specific capacitance of 2205 F g−1 at a current density of 1 A g−1, which remains 1790 F g−1 when the current density is increased to 20 A g−1. After cycling at a current density of 5 A g−1 for 2000 cycles, the NiCo2O4/GF electrode still exhibits 90.7% of its original specific capacitance. Such encouraging rate capability and cycling stability of the NiCo2O4/GF electrode are attributed to the optimized structure of NiCo2O4 that functions synergistically with the underlying GF substrate to achieve excellent electron conductivity and enhanced ion diffusivity. Therefore, the as-synthesized binder-free NiCo2O4/GF electrode is a promising candidate for high-performance pseudocapacitors.
Co-reporter:Xiang Zhang;Jun Zhou;Wenqing Zheng;Dongyang Chen
RSC Advances (2011-Present) 2017 vol. 7(Issue 22) pp:13406-13415
Publication Date(Web):2017/02/24
DOI:10.1039/C6RA28083H
3D electrodes are of significant importance for the development of wearable electronics. In this manuscript, nitrogen doped graphite felt (NGF) and Ni1.4Co1.6S4 have been selected as a 3D conducting matrix and redox-active species for pseudocapacitor electrodes, respectively. The hydrothermal growth of Ni1.4Co1.6S4 in the presence of NGF yields stand-alone and bendable composite electrodes where Ni1.4Co1.6S4 forms porous nanosheets dispersed uniformly along the NGF surface. The experimental results show that the Ni1.4Co1.6S4/NGF electrode achieves a remarkable specific capacitance of 1625 F g−1 at a current density of 1 A g−1, which is maintained at 1465 F g−1 when the current density is increased to 20 A g−1. After cycling at a current density of 20 A g−1 for 2000 cycles, the Ni1.4Co1.6S4/NGF electrode still delivers 90.2% of its original specific capacitance. Such encouraging rate capability and cycling stability of the Ni1.4Co1.6S4/NGF electrode are attributed to the desirable Ni1.4Co1.6S4 nanostructure and the synergistic effect of the good electron conductivity and excellent surface property of the NGF substrate. The outstanding electrochemical performance of the Ni1.4Co1.6S4/NGF electrode makes it a promising candidate for 3D pseudocapacitor applications.
Co-reporter:Yanbing Zhang, Yuying Zheng, Xuehong Chen and Binbin Fu
RSC Advances 2016 vol. 6(Issue 70) pp:65392-65396
Publication Date(Web):04 Jul 2016
DOI:10.1039/C6RA10482G
Ce2O3–CeO2–CuO–MnO2/CNTs catalysts were synthesized via a redox strategy, and presented 58–85% NO conversion at 80–180 °C. The 6% Ce2O3–CeO2–CuO–MnO2/CNTs catalyst displayed the optimal activity, which may be owing to the generation of amorphous mixed metal-oxide catalysts, and higher contents of Ce3+ and surface oxygen (Oy). The formation mechanism of the catalysts was proposed.
Co-reporter:Jing Cao, Yuying Zheng, Tengfei Lin
Polymer Testing 2016 Volume 55() pp:318-327
Publication Date(Web):October 2016
DOI:10.1016/j.polymertesting.2016.09.007
β-nucleated long chain branched (LCB) polypropylene random copolymers (PPRs) were prepared via reactive extrusion by introducing β nucleating agent (NA), dicumyl peroxide (DCP) and various contents of 1, 6-Hexanediol diacrylate (HDDA) into PPR. Results of Fourier infrared spectroscopy (FTIR) and the rheological properties demonstrate the existence of LCB polypropylene. Mechanical properties including impact strength, tensile strength and elongation at break were studied. The crystal structure, morphology and crystallization behavior were investigated via wide-angle X-ray diffraction (WAXD), polarized light microscopy (PLM) and differential scanning calorimetry (DSC). Non-isothermal crystallization kinetics using the Jeziorny method was also studied. The results show an increased LCB degree with increasing HDDA amount. For the sample with a moderate LCB level, synergistic toughening effect of NA and LCB is achieved without deterioration of yield strength or elongation at break, partially because of its higher β-phase content and much smaller spherulite size. It exhibits the minimum values of Tc and Zc1, and the maximum values of t1/2 and n1 in the primary stage of crystallization, regardless of the cooling rate, indicating a slower crystallization rate and more complicated nucleation and crystal growth model.
Co-reporter:Jing Cao;Na Wen;Yu-ying Zheng 郑玉婴
Chinese Journal of Polymer Science 2016 Volume 34( Issue 9) pp:1158-1171
Publication Date(Web):2016 September
DOI:10.1007/s10118-016-1830-4
Long chain branched polypropylene random copolymers (LCB-PPRs) were prepared via reactive extrusion with the addition of dicumyl peroxide (DCP) and various amounts of 1,6-hexanediol diacrylate (HDDA) into PPR. Fourier transform infrared spectrometer (FTIR) was applied to confirm the existence of branching and investigate the grafting degree for the modified PPRs. Melt flow index (MFI) and oscillatory shear rheological properties including complex viscosity, storage modulus, loss tangent and the Cole-Cole plots were studied to differentiate the LCB-PPRs from linear PPR. Differential scanning calorimetry (DSC) and polarized light microscopy (PLM) were used to study the melting and crystallization behavior and the spherulite morphology, respectively. Qualitative and quantitative analyses of rheological curves demonstrated the existence of LCB. The effect of the LCB on crystalline morphology, crystallization behavior and molecular mobility, and, thereby, the mechanical properties were studied and analyzed. Due to the entanglements between molecular chains and the nucleating effect of LCB, LCB-PPRs showed higher crystallization temperature and crystallinity, higher crystallization rate, more uniformly dispersed and much smaller crystallite compared with virgin PPR, thus giving rise to significantly improve impact strength. Moreover, the LCB-PPRs exhibited the improved yield strength. The mobility of the molecular chain segments, as demonstrated by dynamic mechanical analysis (DMA), was improved for the modified PPRs, which also contributed to the improvement of their mechanical properties.
Co-reporter:Xianbin Liu, Na Wen, Xiaoli Wang, and Yuying Zheng
ACS Sustainable Chemistry & Engineering 2015 Volume 3(Issue 3) pp:475
Publication Date(Web):February 4, 2015
DOI:10.1021/sc5006999
An effective design and fabrication of a more steady structure for high-performance electrodes applications still remains a challenge. Herein, we have designed and fabricated a hierarchical heterostructure of a graphene@polyaniline@graphene sandwich consisting of hollow polyaniline spheres as the sandwich layer and graphene both as an internal skeleton shell and a cladding layer. The special sandwich configuration not only enlarged the specific surface area but also improved the electrical conductibility. Most importantly, the graphene double shells could prevent the structural breakdown (swelling or shrinkage) of polyaniline. Therefore, as a supercapacitor electrode, the hybrid exhibited excellent performance with a specific capacitance of 682.75 F g–1 at 0.5 A g–1 and a remarkable cycling stability with capacitance retentions of 92.8% after 1000 cycles and even 87.6% after 10,000 cycles, which were better than those of pure polyaniline. In addition, the specific capacitance could reach 217.11 F g–1 at a high current density of 20 A g–1. Thus, it could be considered as a perspective electrode for the next generation of high-performance supercapacitors.Keywords: Cycling stability; Hollow structure; Polyaniline; Sandwich; Supercapacitors;
Co-reporter:Yanbing Zhang, Yuying Zheng, Xie Wang and Xiulian Lu
RSC Advances 2015 vol. 5(Issue 36) pp:28385-28388
Publication Date(Web):17 Mar 2015
DOI:10.1039/C5RA01129A
Highly active Mn–CeOx/CNTs catalysts were first fabricated by a novel redox method, and a formation mechanism was proposed. The as-obtained catalyst possessed an amorphous structure, and high Ce3+/(Ce3+ + Ce4+) and Oα/(Oα + Oβ) ratios, which endowed it with 52.2–98.4% NO conversion at a weight hourly space velocity of 210000 ml gcat−1 h−1.
Co-reporter:Xianbin Liu;Xiaoli Wang
Chemistry - A European Journal 2015 Volume 21( Issue 29) pp:10408-10415
Publication Date(Web):
DOI:10.1002/chem.201501245
Abstract
In order to explore the effect of graphene surface chemistry on electrochemical performance based on polyaniline–graphene hybrid material electrodes, four different polyaniline–graphene nanocomposites were fabricated with graphene oxide, reduced graphene oxide, aminated graphene and sulfonated graphene as carriers, respectively. The nanocomposites feature various structures and morphologies, which could be used to more deeply understand the morphology and structure effects caused by surface chemistry on electrochemical performance. The experimental results reveal that functionalized electronegative graphene was conducive to the vertical and neat growth of polyaniline (PANI) nanorods. The array architecture endowed the PANI–GS nanocomposite with a large ion-accessible surface area and high-efficiency electron- and ion-transport pathways. Meanwhile, the introduction of sulfonic acid functional groups accelerated the redox reaction with doping and dedoping of the PANI. Thereby, the PANI–GS nanocomposite exhibited a high specific capacitance of 863.2 F g−1 at a current density of 0.2 A g−1 and the excellent rate capability of 67.4 % (581.6 F g−1 at 5 A g−1), which were much better than the other three nanocomposites produced.
Co-reporter:Xianbin Liu, Pengbo Shang, Yanbing Zhang, Xiaoli Wang, Zhimin Fan, Bingxi Wang and Yuying Zheng
Journal of Materials Chemistry A 2014 vol. 2(Issue 37) pp:15273-15278
Publication Date(Web):21 Jul 2014
DOI:10.1039/C4TA03077J
A novel route is introduced to synthesize hierarchical polyaniline-grafted reduced graphene oxide (rGO) hybrid materials by polyaniline nanorods covalently bonded on the surface of rGO. Aminophenyl groups were initially grafted on rGO via diazonium treatment. Then the PANI nanorods were aligned vertically on rGO to construct a three-dimensional (3D) structure. The 3D structure could shorten the electronic transmission path and form abundant space for electrolyte ions. The hybrid materials fabricated as supercapacitor electrodes exhibited a maximal specific capacitance of 1045.51 F g−1, and the energy density (E) could achieve an upper value of 8.3 W h kg−1 at the current density of 0.2 A g−1 simultaneously. Such highly stable three-dimensional structural materials are very promising for the next generation of high-performance electrochemical supercapacitors.
Co-reporter:Xie Wang, Yuying Zheng, Zhe Xu, Yi Liu and Xiaoli Wang
Catalysis Science & Technology 2014 vol. 4(Issue 6) pp:1738-1741
Publication Date(Web):26 Feb 2014
DOI:10.1039/C4CY00026A
Herein, we report a simple and effective way to prepare Mn–Ce mixed-oxide catalysts supported on carbon nanotubes for low-temperature selective catalytic reduction of NO with NH3. The catalysts with amorphous structures all showed nearly 100% NO conversion at 120–180 °C with a space velocity of 30000 h−1.
Co-reporter:Yuying Zheng, Yanbing Zhang, Xie Wang, Zhe Xu, Xianbin Liu, Xiulian Lu and Zhimin Fan
RSC Advances 2014 vol. 4(Issue 103) pp:59242-59247
Publication Date(Web):27 Oct 2014
DOI:10.1039/C4RA07168A
A manganese dioxide (MnO2)/polypyrrole (PPy) nanocoating was uniformly decorated on the surface of polyphenylene sulfide (PPS) filter felt via an in situ synthesis method to fabricate a catalytic filter material. The pyrrole functioned as a dispersant for the MnO2 catalysts and the PPy generated acted as a binder to adhere the MnO2 catalysts and filter felt together. The catalytic filter material obtained, had a high adhesive strength between that of the MnO2/PPy nanocoating and the PPS filter felt, and was used for the selective catalytic reduction of nitric oxide (NO) with ammonia under model conditions without any sulfur dioxide or water vapor in the gas. More than 70% conversion of NO was achieved at 160–180 °C at a high space velocity of 38000 h−1.
Co-reporter:Youyou Xiao;Xie Wang;Zhijie Chen;Zhe Xu
Journal of Applied Polymer Science 2014 Volume 131( Issue 19) pp:
Publication Date(Web):
DOI:10.1002/app.40845
ABSTRACT
A novel flame-retardant synergist, chitosan/urea compound based phosphonic acid melamine salt (HUMCS), was synthesized and characterized by Fourier transform infrared spectroscopy and 31P-NMR. Subsequently, HUMCS was added to a fire-retardant polypropylene (PP) compound containing an intumescent flame-retardant (IFR) system to improve its flame-retardant properties. The PP/IFR/HUMCS composites were characterized by limiting oxygen index (LOI) tests, vertical burning tests (UL-94 tests), microscale combustion calorimetry tests, and thermogravimetric analysis to study the combustion behavior and thermal stability. The addition of 3 wt % HUMCS increased the LOI from 31.4 to 33.0. The addition of HUMCS at a low additive amount reduced the peak heat-release rate, total heat release, and heat-release capacity obviously. Furthermore, scanning electron micrographs of char residues revealed that HUMCS could prevent the IFR–PP composites from forming a dense and compact multicell char, which could effectively protect the substrate material from combusting. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40845.
Co-reporter:Xie Wang, Yuying Zheng, Zhe Xu, Xiaoli Wang and Xiaoping Chen
RSC Advances 2013 vol. 3(Issue 29) pp:11539-11542
Publication Date(Web):22 May 2013
DOI:10.1039/C3RA41512K
Amorphous MnO2 supported on carbon nanotubes were prepared using a co-precipitation method at room temperature and firstly used for the selective catalytic reduction of NO with NH3. The catalysts showed superior low temperature activity than that of the catalyst prepared using the conventional wet impregnation method.
Co-reporter:Mingping He, Yuying Zheng, Qifeng Du
Materials Letters 2013 Volume 104() pp:48-52
Publication Date(Web):1 August 2013
DOI:10.1016/j.matlet.2013.04.008
•Polypyrrole/MnO2/graphite felt composite was fabricated for the first time.•The polypyrrole/MnO2 composites deposited on graphite felt constructs a unique three-dimensional network structure.•The capacitance value of polypyrrole/MnO2/graphite felt is much higher than most of the polypyrrole/MnO2 composites reported previously.Polypyrrole/MnO2 composites with unique three-dimensional network structure were successfully deposited on graphite felt (GF) fibers at the temperature of 50 °C to fabricate PYMG-HT composite, which can be used as a free-standing electrode for supercapacitors. For comparison, PYMG-LT electrode was also prepared in ice bath, and the polypyrrole/MnO2 deposits on GF prepared at 0 °C exhibit nano-flower shape, which is different from PYMG-HT. The PYMG-HT electrode displays specific capacitance as high as 821.3 F g−1 at the current density of 0.5 A g−1, which is much higher than that of PPy/MnO2 reported previously. Moreover, the PYMG-HT exhibits enhanced capacitive performance compared to PYMG-LT electrode.Graphical abstract
Co-reporter:Mingping He;Qifeng Du
Polymer Composites 2013 Volume 34( Issue 6) pp:819-824
Publication Date(Web):
DOI:10.1002/pc.22481
Polyaniline/MnO2/graphite felt (PMGF) composite, which can be used as a novel free-standing, flexible electrode for supercapacitors, was fabricated via a facile electrochemical method. Polyaniline/graphite felt (PANI/GF) electrode was prepared by electropolymerization of PANI onto the GF. Subsequently, manganese dioxide (MnO2) was electrodeposited on the surface of the PANI/GF electrode to prepare PMGF electrode. The microstructure and morphology of the as-prepared samples were characterized by Fourier transform infrared spectra, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Specific surface area was examined using N2 adsorption/desorption test. Cyclic voltammogram, chronopotentiometry techniques and electrochemical impedance spectroscopy were introduced to investigate the electrochemical performance of the composites. The PMGF electrode exhibited specific capacitance as high as about 630 F g−1 at the current density of 0.5 A g−1, which is much higher than that of PANI/MnO2 composites reported previously. The high specific capacitance of PMGF may be attributed to the fact that the porous GF is a good conductive matrix for the dispersion of PANI/MnO2 and it can facilitate easy access of electrolytes to the electrode, which results in enhancement of the electrochemical performance of the composite. Moreover, the specific capacitance of PMGF is much larger than that of MnO2/GF (MGF), which may be ascribed to the participant of PANI, which contributes additional pseudocapacitance and electron transport path. POLYM. COMPOS., 34:819–824, 2013. © 2013 Society of Plastics Engineers
Co-reporter:Pan Wang, Yuying Zheng, Baoming Li
Synthetic Metals 2013 Volume 166() pp:33-39
Publication Date(Web):15 February 2013
DOI:10.1016/j.synthmet.2013.01.002
Polypyrrole/graphite oxide (PPy/GO) composites are successfully prepared via in situ chemical polymerization with various feed ratios of pyrrole (Py) to graphite oxide (Py:GO = 0.5:1, 1:1, 3:1, 5:1). The electrochemical performance of the composites is determined in a three-electrode cell using cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS) techniques. The relationship between properties of PPy/GO composites and effect of the feed ratio of pyrrole to GO is investigated, and the results indicate that the thermal stability, electrical and electrochemical properties of the composites are strongly influenced by the feed ratios. The electrical conductivities of the PPy/GO composites are 1.27 S cm−1 (Py:GO = 3:1) and 6.25 S cm−1 (Py:GO = 5:1), which are significantly larger than that of pristine PPy and GO. The PPy/GO composites exhibit very high specific capacitance and low charge transfer resistance. Especially, the specific capacitance of the PPy/GO composites (Py:GO = 3:1) reaches 249 F g−1 at discharge current density of 2 mA cm−2, while the charge transfer resistance is only 0.12 Ω. The fabricated PPy/GO composites can be used for the development of new applications for supercapacitor.Highlights► PPy/GO composites are fabricated by in situ chemical polymerization with various feed ratios of pyrrole to graphite oxide. ► The relationship between properties of PPy/GO composites and effect of the feed ratio of pyrrole to GO is investigated in detail. ► The surface of GO sheets is quite uniformly coated with PPy in PPy/GO composites. ► The electrical conductivities of PPy/GO composites are 1.27 S cm−1 (Py:GO = 3:1) and 6.25 S cm−1 (Py:GO = 5:1).
Co-reporter:Pan Wang, Yuying Zheng, Baoming Li
Materials Letters 2013 Volume 92() pp:147-150
Publication Date(Web):1 February 2013
DOI:10.1016/j.matlet.2012.10.078
Poly(3-acetylpyrrole) (PAPy)/multi-walled carbon nanotubes (MWNTs) composites are fabricated by in situ chemical polymeriation of 3-acetylpyrrole (APy) on MWNTs. The electrical and electrochemical properties of the resulting composites are investigated using a four-probe method, and cyclic voltammetry (CV), galvanostatic charge–discharge (GCD) and electrochemical impedance spectroscopy (EIS) techniques, respectively. The electrical conductivity and specific capacitance of the composites are 1.64 S cm−1 and 65 F g−1 (APy:MWNTs=2.5:1), and 0.35 S cm−1 and 53 F g−1 (APy:MWNTs=5:1), respectively. In addition, the effect of the feed ratio of APy to MWNTs is also discussed in detail.Highlights► PAPy/MWNTs composites are first fabricated via in situ chemical polymeriation of APy on MWNTs. ► The morphology, electrical and electrochemical properties of PAPy/MWNTs composites are investigated in detail. ► The relationship between properties of PAPy/MWNTs composites and the effect of the feed ratio of APy to MWNTs are discussed.
Co-reporter:Mingping He;Qifeng Du
Polymer Composites 2012 Volume 33( Issue 10) pp:1759-1763
Publication Date(Web):
DOI:10.1002/pc.22314
Abstract
A novel conjugated polymer containing electron transport groups with high electron affinity, denoted POXD was synthesized upon polycondensation. The polymer was characterized by Fourier transform infrared (FTIR) spectra and 1H nuclear magnetic resonance (1H NMR) spectroscopy. Furthermore, the conjugated polymer/graphene (POXD/RGO) composite film was prepared, which was subsequently used as the support for the electrodeposition of platinum. The microstructure and morphology of the prepared samples were characterized by X-ray photoelectron spectroscopy (XPS) and field emission scanning electron microscopy (FE-SEM). The electrocatalytic activity for the oxidation of methanol was investigated through cyclic voltammogram method. The POXD/RGO composite film can facilitate the electrodeposition of Pt nanoparticles compared with graphene (RGO) support. The POXD/RGO/Pt composite exhibits more excellent electrocatalytic property for the oxidation of methanol, such as lower oxidation potential and higher current intensity, which might be attributed to the high electron affinity of the polymer and the interaction of the Pt nanoparticles with polymer. POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers
Co-reporter:Yuying Zheng;Pan Wang;Baoming Li
Journal of Applied Polymer Science 2012 Volume 125( Issue 5) pp:3956-3962
Publication Date(Web):
DOI:10.1002/app.36416
Abstract
Conducting poly(3-acetylpyrrole) (PAPy)/multiwalled carbon nanotubes (MWNTs) composites were synthesized by the in situ chemical polymerization of 3-acetylpyrrole (APy) onto MWNTs. The structure and morphology of the PAPy/MWNT composites were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction, field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and thermogravimetric analysis. The FTIR results indicated that no chemical reaction occurred between the PAPy and MWNTs, and only the MWNTs served as a template for APy polymerization. FE-SEM and TEM suggested that PAPy was only coated on the surface of the carbon nanotubes, and the thickness of the PAPy coating on each nanotube was dependent on the ratio of APy to MWNTs. The standard four-probe method was used to measure the electrical conductivity of the samples at room temperature, and the results show that the MWNTs enhanced the electrical conductivity of the composites compared to PAPy. In addition, the solution stability of the suspension with the PAPy [or polypyrrole (PPy)]/MWNT composites was investigated; this showed that the dispersion of the PAPy/MWNT composites in ethanol solution was much better than that of the PPy/MWNT composites. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
Co-reporter:Anran Zeng, Yuying Zheng, Yong Guo, Shangchang Qiu, Lei Cheng
Materials & Design 2012 34() pp: 691-698
Publication Date(Web):
DOI:10.1016/j.matdes.2011.05.028
Co-reporter:Yanbing Zhang, Yuying Zheng, Haiqiang Zou, Xiang Zhang
Catalysis Communications (5 November 2015) Volume 71() pp:46-50
Publication Date(Web):5 November 2015
DOI:10.1016/j.catcom.2015.08.011
•Ternary MnO2–Fe2O3–CeO2–Ce2O3/CNT catalysts were synthesized by one-step method.•Ternary MnO2–Fe2O3–CeO2–Ce2O3/CNT showed 73.6–99.4% NO conversion at 120–180 °C.•The as-prepared catalysts mainly consisted of amorphous MnO2, Fe2O3, Ce2O3 and CeO2.In this article, a facile one-step strategy for the synthesis of ternary MnO2–Fe2O3–CeO2–Ce2O3/carbon nanotubes (CNT) catalysts was discussed. The as-prepared catalysts exhibited 73.6–99.4% NO conversion at 120–180 °C at a weight hourly space velocity (WHSV) of 210 000 ml·gcat− 1·h− 1, which benefited from the formation of amorphous MnO2, Fe2O3, CeO2, and Ce2O3, as well as high Ce3 + and surface oxygen (Oε) contents. The mechanism of formation of MnO2–Fe2O3–CeO2–Ce2O3/CNT catalysts was also proposed.Download full-size image
Co-reporter:Yanbing Zhang, Yuying Zheng, Xie Wang, Xiulian Lu
Catalysis Communications (5 March 2015) Volume 62() pp:57-61
Publication Date(Web):5 March 2015
DOI:10.1016/j.catcom.2014.12.023
•Mn–FeOx/CNTs catalysts were firstly prepared by redox co-precipitation method.•12% Mn–FeOx/CNTs catalysts exhibited first-rate SCR activity at 80–180 °C.•The as-obtained catalysts were possessed of amorphous structure.A novel redox co-precipitation method was firstly adopted to prepare the Mn–FeOx/CNTs catalysts for use in low-temperature NO reduction with NH3. The catalysts were possessed of amorphous structure and exhibited 80–100% NO conversion at 140–180 °C at a high space velocity of 32,000 h− 1.Download high-res image (273KB)Download full-size image
Co-reporter:Xianbin Liu, Pengbo Shang, Yanbing Zhang, Xiaoli Wang, Zhimin Fan, Bingxi Wang and Yuying Zheng
Journal of Materials Chemistry A 2014 - vol. 2(Issue 37) pp:NaN15278-15278
Publication Date(Web):2014/07/21
DOI:10.1039/C4TA03077J
A novel route is introduced to synthesize hierarchical polyaniline-grafted reduced graphene oxide (rGO) hybrid materials by polyaniline nanorods covalently bonded on the surface of rGO. Aminophenyl groups were initially grafted on rGO via diazonium treatment. Then the PANI nanorods were aligned vertically on rGO to construct a three-dimensional (3D) structure. The 3D structure could shorten the electronic transmission path and form abundant space for electrolyte ions. The hybrid materials fabricated as supercapacitor electrodes exhibited a maximal specific capacitance of 1045.51 F g−1, and the energy density (E) could achieve an upper value of 8.3 W h kg−1 at the current density of 0.2 A g−1 simultaneously. Such highly stable three-dimensional structural materials are very promising for the next generation of high-performance electrochemical supercapacitors.
Co-reporter:Xie Wang, Yuying Zheng, Zhe Xu, Yi Liu and Xiaoli Wang
Catalysis Science & Technology (2011-Present) 2014 - vol. 4(Issue 6) pp:NaN1741-1741
Publication Date(Web):2014/02/26
DOI:10.1039/C4CY00026A
Herein, we report a simple and effective way to prepare Mn–Ce mixed-oxide catalysts supported on carbon nanotubes for low-temperature selective catalytic reduction of NO with NH3. The catalysts with amorphous structures all showed nearly 100% NO conversion at 120–180 °C with a space velocity of 30000 h−1.
