Co-reporter:Xu Liu;Yuwei Wang;Tao Zhou;Mengzhou Yu;Luyang Xiu;Jieshan Qiu
Journal of Materials Chemistry A 2017 vol. 5(Issue 21) pp:10398-10405
Publication Date(Web):2017/05/30
DOI:10.1039/C7TA01701D
The interest in Na-ion batteries (NIBs) is growing exponentially since Na is more abundant and affordable than Li for large-scale energy storage applications. However, the lack of truly durable and high-capacity electrode materials still remains a key bottle-neck issue for the development of practical NIBs. In this work, we report the rational design of an ultra-long life anode material for NIBs by integrating the structural merits of hollow nanostructures, carbon nanocoating and amorphous structures together into a binary metal sulfide system. Amorphous CoSnSx nanoboxes sheathed in N-doped carbon are yielded by templating against single-crystalline CoSn(OH)6 nanoboxes, followed by polymer nanoplating and carbonization. The synergy of diverse structural features enables a robust structure and fast reaction kinetics for Na storage in the CoSnSx@NC anode, leading to an exceptionally long cycle life of 4000 cycles with very slow capacity loss (0.0075% per cycle) and high power output. The full cells assembled from the Na3V2(PO4)3/C cathode and the CoSnSx@NC anode deliver a high energy density of up to 86.6 W h kg−1, as well as good capacity retention at high current rate.
Co-reporter:Mengzhou Yu 于梦舟;Si Zhou 周思;Yang Liu 刘洋 王治宇
Science China Materials 2017 Volume 60( Issue 5) pp:415-426
Publication Date(Web):12 April 2017
DOI:10.1007/s40843-017-9021-6
Rechargeable Li-O2 batteries have attracted considerable interests because of their exceptional energy density. However, the short lifetime still remained as one of the bottle-neck obstacles for the practical application of rechargeable Li-O2 batteries. The development of efficient cathode catalyst is highly desirable to reduce the energy barrier of Li-O2 reaction and electrode failure. In this work, we report a facile strategy for the fabrication of a high-performance cathode catalyst for rechargeable Li-O2 batteries by the encapsulation of high content of active Fe nanorods into N-doped carbon nanotubes with high stability (denoted as Fe@NCNTs). First-principles calculations reveal that the synergistic charge transfer and redistribution between the interface of Fe nanorods, the CNT walls and the active N dopants greatly facilitate the chemisorption and subsequent dissociation of O2 molecules into the epoxy intermediates on the carbon surface, which benefits the uniform growth of nanosized discharge products on CNT surface and thus boosts the reversibility of Li-O2 reactions. As a result, the cathode with Fe@NCNT catalyst exhibits long cycling stability with high capacities (1000 mA h g−1 for 160 cycles and 600 mA h g−1 for 270 cycles). Based on the total mass of Fe@NCNTs + Li2O2, high gravimetric energy densities of 2120–2600 W h kg−1 can be achieved at the power densities of 50–795 W kg−1.锂-空气二次电池是当前能量密度最高的二次电池体系之一, 高效阴极催化剂的创制构筑是构筑高性能锂-空气电池的关键技术之一. 本文基于简便易行的全固相热解反应, 设计构筑了一种具有纳米电缆结构的新型铁-碳纳米管电化学催化剂. 第一性原理计算表明碳纳米 管与其内部包覆的铁纳米棒之间的电荷迁移与协同分布效应可有效促进氧气在碳纳米管表面的化学吸附与转化. 得益于此, 基于其的锂- 空气电池在限制比容量为600 mA h g−1时, 循环寿命可达270次, 基于此催化剂与固态放电产物(Li2O2)总质量的电极比能量可达2120–2600 W h kg−1. 本研究为锂-空气二次电池用高性能阴极催化剂的开发提供了有效途径.
Co-reporter:Xianhong Wu;Mengzhou Yu;Luyang Xiu;Jieshan Qiu
Advanced Materials 2017 Volume 29(Issue 24) pp:
Publication Date(Web):2017/06/01
DOI:10.1002/adma.201607017
The MXenes combining hydrophilic surface, metallic conductivity and rich surface chemistries represent a new family of 2D materials with widespread applications. However, their poor oxygen resistance causes a great loss of electronic properties and surface reactivity, which significantly inhibits the fabrication, the understanding of the chemical nature and full exploitation of the potential of MXene-based materials. Herein we report a facile carbon nanoplating strategy for efficiently stabilizing the MXenes against structural degradation caused by spontaneous oxidation, which provides a material platform for developing MXene-based materials with attractive structure and properties. Hierarchical MoS2/Ti3C2-MXene@C nanohybrids with excellent structural stability, electrical properties and strong interfacial coupling are fabricated by assembling carbon coated few-layered MoS2 nanoplates on carbon-stabilized Ti3C2 MXene, exhibiting exceptional performance for Li storage and hydrogen evolution reaction (HER). Remarkably, ultra-long cycle life of 3000 cycles with high capacities but extremely slow capacity loss of 0.0016% per cycle is achieved for Li storage at a very high rate of 20 A g−1. They are also highly active HER electrocatalyst with very positive onset potential, low overpotential and long-term stability in acidic solution. Superb properties highlight the great promise of MXene-based materials in cornerstone applications of energy storage and conversion.
Co-reporter:Zheng Ling;Mengdi Zhang;Chang Yu;Gang Wang;Yanfeng Dong;Shaohong Liu;Yuwei Wang ;Jieshan Qiu
Advanced Functional Materials 2016 Volume 26( Issue 1) pp:111-119
Publication Date(Web):
DOI:10.1002/adfm.201504004
The practical application of graphene has still been hindered by high cost and scarcity in supply. It boosts great interest in seeking for low-cost substitute of graphene for upcoming usage where extremely physical properties are not absolutely critical. The conversion of renewable biomass offers a great opportunity for sustainable and economic fabrication of 2D carbon nanostructures. However, large-scale production of carbon nanosheets with ultrahigh aspect ratio, satisfied electronic properties, and the capability of organized assembly like graphene has been rarely reported. In this work, a facile yet efficient approach for mass production of flexible boric/nitrogen co-doped carbon nanosheets with very thin thickness of 5–8 nm and ultrahigh aspect ratio of over 6000–10 000 is demonstrated by assembling the biomass molecule in long-range order on 2D hard template and subsequent annealing. The advantage of these doped carbon nanosheets over conventional products lies in that they can be readily assembled to multilevel architectures such as freestanding flexible thin film and ultralight aerogels with better electrical properties, which exhibit exceptional capacitive performance for supercapacitor application. The recyclability of boric acid template further reduces the discharge of the waste and processing cost, rendering high cost-effectiveness and environmental benignity for scalable production.
Co-reporter:Shaohong Liu;Yuwei Wang;Yanfeng Dong; Zongbin Zhao; Zhiyu Wang; Jieshan Qiu
ChemElectroChem 2016 Volume 3( Issue 1) pp:38-44
Publication Date(Web):
DOI:10.1002/celc.201500410
Abstract
One promising and economic step towards technological advancements in Na-ion and Li-ion batteries is to develop versatile electrode materials for alkali-metal storage. Transitional-metal oxides are appealing candidates, owing to their intrinsically low cost, high capacity, and enhanced safety. However, they generally show poor activity and a short lifespan in practical use. Herein, we report the fabrication of a versatile long-life, high-rate anode material for Li/Na storage by strongly binding ultrafine Fe3O4 quantum dots onto hybrid carbon nanosheets. Such nanocomposites are advantageous for inhibiting particle aggregation, reducing ionic diffusion pathways, and enabling fast accessibility to electrolyte ions across large electrode–electrolyte interfaces. They exhibit a long lifetime of 1000 cycles, high capacities, and exceptional high rate capabilities towards alkali-metal storage, highlighting great promise in high-energy and high-power energy applications.
Co-reporter:Shaohong Liu;Yuwei Wang;Yanfeng Dong; Zongbin Zhao; Zhiyu Wang; Jieshan Qiu
ChemElectroChem 2016 Volume 3( Issue 1) pp:
Publication Date(Web):
DOI:10.1002/celc.201500528
Co-reporter:Shaohong Liu, Yanfeng Dong, Zhiyu Wang, Huawei Huang, Zongbin Zhao and Jieshan Qiu
Journal of Materials Chemistry A 2015 vol. 3(Issue 39) pp:19657-19661
Publication Date(Web):04 Sep 2015
DOI:10.1039/C5TA05776K
A highly efficient electrocatalyst is developed by chemical coordination of cobalt species with g-C3N4 layers which are homogeneously supported on reduced graphene oxide. The formation of Co-Nx complex active sites greatly enhances the electrocatalytic activity and durability towards the oxygen reduction reaction.
Co-reporter:Yanfeng Dong, Shaohong Liu, Zhiyu Wang, Yang Liu, Zongbin Zhao and Jieshan Qiu
RSC Advances 2015 vol. 5(Issue 12) pp:8929-8932
Publication Date(Web):22 Dec 2014
DOI:10.1039/C4RA14519D
Compressible graphene aerogel (CGA) supported CoO nanostructures were synthesized via a hydrothermal strategy. Benefitting from good mechanical stability, they can be directly used as binder-free electrodes in lithium-ion batteries, which exhibit superior electrochemical performance to conventional electrodes made of powders and binders.
Co-reporter:Xu Zhang, Chang Yu, Chunlei Wang, Zhiyu Wang, Jieshan Qiu
Materials Research Bulletin 2015 67() pp: 77-82
Publication Date(Web):
DOI:10.1016/j.materresbull.2015.03.002
Co-reporter:Shaohong Liu, Yanfeng Dong, Changtai Zhao, Zongbin Zhao, Chang Yu, Zhiyu Wang, Jieshan Qiu
Nano Energy 2015 Volume 12() pp:578-587
Publication Date(Web):March 2015
DOI:10.1016/j.nanoen.2015.01.016
•Multifunctional nanohybrids are made by chemically coupling Fe3O4 nanoparticles to rGO with N-rich carbon (CNx) layer as 2D crosslinker.•CNx layer with 59 wt% N greatly enhance the affinity of Fe3O4 nanoparticles to rGO.•Very long lifespan of 1000 cycles with high capacities for lithium storage at high rate.•Excellent catalytic activity and durability towards ORR vs. commercial Pt/C catalyst.Graphene-based nanohybrids are very appealing materials for energy storage and conversion applications. Strong binding of nanostructured guest materials with favorable properties and coupling effect to graphene is highly desirable to enhance the structural stability, interfacial characteristics and reaction kinetics of the nanohybrids. In this work, we present the fabrication of novel multifunctional nanohybrids by chemically coupling ultrafine metal oxide (e.g., Fe3O4) nanoparticles to reduced graphene oxide (rGO) with a thin layer of nitrogen-rich carbon (CNx) as 2D crosslinker. The combination and synergy of rGO and CNx layer with extremely high N content (59 wt%) modify the interfacial properties for homogenous and firm growth of Fe3O4 nanoparticles on rGO without compromising the intrinsic properties of rGO. When evaluated as anode materials in lithium-ion batteries, Fe3O4/CNx/rGO nanohybrids exhibit very long lifespan of 1000 cycles with high capacities at high current densities of 2–5 A g−1, as well as excellent high-rate capability of up to 10 A g−1. As a non-precious metal catalyst, these nanohybrids also exhibit comparable catalytic activity towards oxygen reduction reaction to commercial Pt/C catalyst in terms of high electron transfer number, high current density, good durability and methanol tolerance capability.
Co-reporter:Xu Zhang, Zhiyu Wang, Shuang Li, Chunlei Wang and Jieshan Qiu
RSC Advances 2014 vol. 4(Issue 104) pp:59977-59980
Publication Date(Web):06 Nov 2014
DOI:10.1039/C4RA12029A
Highly compressible 3D graphene aerogels have been fabricated by chemical reduction of graphene oxide with hydroiodic acid at low temperature. They serve as ideal supports to anchor Pd nanoparticles, exhibiting high activity and selectivity with good recyclability towards selective semi-hydrogenation of phenylacetylene to styrene in solution.
Co-reporter:Yanfeng Dong, Mengzhou Yu, Zhiyu Wang, Tao Zhou, Yang Liu, Xuzhen Wang, Zongbin Zhao, Jieshan Qiu
Energy Storage Materials (April 2017) Volume 7() pp:181-188
Publication Date(Web):1 April 2017
DOI:10.1016/j.ensm.2017.01.011
High cost and scarcity of graphene boosts the great interests in seeking for its low-cost substitute, e.g., 2D carbons, for upcoming energy applications where extreme physical properties are not absolutely critical. Metal-organic frameworks (MOFs) are very convenient self-templated precursor towards carbon-based materials with tunable functionalities. However, the morphology of most MOF-derived carbons is largely limited to solid particles with limited active surface and diffusion kinetics. The morphology control is still remained the bottleneck for developing high-performance MOF-derived carbons with widespread applications until now. Here we report a general strategy for morphology control of zeolitic imidazolate framework (ZIF)-derived 2D carbon nanostructures by layered-nanospace-confinement growth of 2D ZIFs and in-situ carbonization. The process yields ZIF-derived porous carbon nanosheets with high level of planar N doping (over 93% in total N content) and highly tunable chemical compositions (pure carbon or decorated with various metals such as Co, Fe, Ni, NiCox, etc.). Unique 2D nanostructure renders them with extra exposed active surface area, more accessible porosity with much higher pore volume and shorter diffusion distance as compared to the particulate counterparts. Benefited from enhanced activity and diffusion kinetics, the ZIF-derived porous carbon nanosheets exhibit superior onset potential, current density and durability to commercial Pt catalyst and their particulate counterparts for oxygen reduction reactions in both alkaline and acidic medium.A general strategy is developed for the synthesis of ZIF-derived planar-N-doped porous carbon nanosheets with tunable composition and microstructure via the intercalation of ZIF into layer-structured template, followed by nanospace-confined carbonization and acidic etching. Benefited from unique structure, they exhibit superior electrochemical performance as electrocatalysts for oxygen reduction reactions.Download high-res image (258KB)Download full-size image
Co-reporter:Xu Liu, Yuwei Wang, Zhiyu Wang, Tao Zhou, Mengzhou Yu, Luyang Xiu and Jieshan Qiu
Journal of Materials Chemistry A 2017 - vol. 5(Issue 21) pp:NaN10405-10405
Publication Date(Web):2017/04/25
DOI:10.1039/C7TA01701D
The interest in Na-ion batteries (NIBs) is growing exponentially since Na is more abundant and affordable than Li for large-scale energy storage applications. However, the lack of truly durable and high-capacity electrode materials still remains a key bottle-neck issue for the development of practical NIBs. In this work, we report the rational design of an ultra-long life anode material for NIBs by integrating the structural merits of hollow nanostructures, carbon nanocoating and amorphous structures together into a binary metal sulfide system. Amorphous CoSnSx nanoboxes sheathed in N-doped carbon are yielded by templating against single-crystalline CoSn(OH)6 nanoboxes, followed by polymer nanoplating and carbonization. The synergy of diverse structural features enables a robust structure and fast reaction kinetics for Na storage in the CoSnSx@NC anode, leading to an exceptionally long cycle life of 4000 cycles with very slow capacity loss (0.0075% per cycle) and high power output. The full cells assembled from the Na3V2(PO4)3/C cathode and the CoSnSx@NC anode deliver a high energy density of up to 86.6 W h kg−1, as well as good capacity retention at high current rate.
Co-reporter:Shaohong Liu, Yanfeng Dong, Zhiyu Wang, Huawei Huang, Zongbin Zhao and Jieshan Qiu
Journal of Materials Chemistry A 2015 - vol. 3(Issue 39) pp:NaN19661-19661
Publication Date(Web):2015/09/04
DOI:10.1039/C5TA05776K
A highly efficient electrocatalyst is developed by chemical coordination of cobalt species with g-C3N4 layers which are homogeneously supported on reduced graphene oxide. The formation of Co-Nx complex active sites greatly enhances the electrocatalytic activity and durability towards the oxygen reduction reaction.
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