期刊
INORGANIC CHEMISTRY FRONTIERS
卷 6, 期 8, 页码 2090-2095出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9qi00554d
关键词
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资金
- National Natural Science Foundation of China [21675127]
- Shaanxi Provincial Science Fund for Distinguished Young Scholars [2018JC-011]
- Development Project of Qinghai Provincial Key Laboratory [2017-ZJ-Y10]
- Capacity Building Project of Engineering Research Center of Qinghai Province [2017-GX-G03]
It is crucial to develop non-noble metal bifunctional electrocatalysts with high activity and favorable stability for overall water splitting under basic conditions for renewable-energy conversion techniques. Direct assembly of active materials on carbon cloth is a promising approach to realize flexible electrodes for electrocatalysis. Herein, a facile strategy is proposed to synthesize a cobalt sulfide nanoflake array on carbon cloth (CoS NF/CC) as an efficient electrocatalyst for overall water splitting through hydrothermal sulfidation from a ZIL-L-Co derived Co3O4 precursor. The obtained CoS NF/CC has increased catalytic active sites and improved charge-transfer kinetics enabled by the sulfidation process, as well as facilitated electrolyte penetration and gas diffusion enabled by the open-shelled nanoarray structure. This electrode exhibits remarkable bifunctional electrocatalytic activity toward water splitting with a low overpotential of 247 mV to achieve a current density of 50 mA cm(-2) for the HER and 310 mV to achieve 10 mA cm(-2) for the OER. Furthermore, a current density of 10 mA cm(-2) was achieved at a cell voltage of 1.72 V using a full alkaline electrolyzer with the CoS NF/CC as both the cathode and anode, and this performance value could be well maintained for similar to 15 h.
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