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题名: Efficient electrocatalysis of overall water splitting by ultrasmall NixCo3-xS4 coupled Ni3S2 nanosheet arrays
作者: Wu, Yuanyuan1;  Liu, Yipu1;  Li, Guo-Dong1;  Zou, Xu1;  Lian, Xinran1;  Wang, Dejun1, 5;  Sun, Lei4;  Asefa, Tewodros2, 3;  Zou, Xiaoxin1
关键词: Water splitting ;  Nickel sulfide ;  Cobalt sulfide ;  Electrocatalysis ;  Composite material
刊名: NANO ENERGY
发表日期: 2017-05-01
DOI: 10.1016/j.nanoen.2017.03.024
卷: 35, 页:161-170
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary ;  Physics, Applied
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science ;  Physics
英文摘要: The overall water splitting into hydrogen and oxygen is one of the most promising ways to store intermittent solar and wind energy in the form of chemical fuels. However, this process is quite thermodynamically uphill, and thus needs to be mediated simultaneously by efficient hydrogen evolving and oxygen evolving catalysts to get any feasible output from it. Herein, we report the synthesis of such a catalyst comprising ultrasmall NixCo3-xS4-decorated Ni3S2 nanosheet arrays supported on nickel foam (NF) via a partial cation exchange reaction between NF-supported Ni3S2 nanosheet arrays and cobalt(II) ions. We show that the as-prepared material, denoted as NixCo3-xS4/Ni3S2/NF, can serve as a self-standing, noble metal-free, highly active and stable, bifunctional electrocatalyst for the two half reactions involved in the overall water splitting: the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). Furthermore, we demonstrate that a high-performance electrolyzer for the overall water splitting reaction can be assembled by using NixCo3-xS4/Ni3S2/NF as the electrocatalyst at both the cathode and the anode sides of the electrolyzer. This electrolyzer delivers water-splitting current densities of 10 and 100 mA/cm(2) at applied potentials of 1.53 and 1.80 V, respectively, with remarkable stability for >200 h in both cases. The electrolyzer's performance is much better than the performances of electrolyzers assembled from many types of other bifunctional electrocatalysts as catalyst couple. Moreover, the overall performance of the electrolyzer is comparable with the performances of electrolyzers containing two different, benchmark, monofunctional HER and OER electrocatalyst couple (i.e., Pt/C-IrO2).
关键词[WOS]: HYDROGEN EVOLUTION REACTION ;  CATION-EXCHANGE REACTIONS ;  LAYERED DOUBLE HYDROXIDE ;  OXYGEN-EVOLUTION ;  BIFUNCTIONAL ELECTROCATALYSTS ;  HIGH-PERFORMANCE ;  CARBON NANOTUBES ;  CADMIUM IONS ;  RICH CARBON ;  CATALYSTS
语种: 英语
WOS记录号: WOS:000400647900019
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/152020
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Jilin Univ, State Key Lab Inorgan Synth & Preparat Chem, Int Joint Res Lab Nanomicro Architecture Chem, Coll Chem, Changchun 130012, Peoples R China
2.Rutgers State Univ, Dept Chem & Chem Biol, Piscataway, NJ 08854 USA
3.Rutgers State Univ, Dept Chem & Biochem Engn, Piscataway, NJ 08854 USA
4.Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China
5.Tsinghua Univ, Dept Chem, Beijing 100084, Peoples R China

Recommended Citation:
Wu, Yuanyuan,Liu, Yipu,Li, Guo-Dong,et al. Efficient electrocatalysis of overall water splitting by ultrasmall NixCo3-xS4 coupled Ni3S2 nanosheet arrays[J]. NANO ENERGY,2017,35:161-170.
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