期刊
ADVANCED MATERIALS
卷 32, 期 8, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201906915
关键词
heterostructured Ni; Ni(OH)(2) nanosheets; hydrogen evolution reaction; oxygen evolution reaction; partial reduction strategy; water splitting
类别
资金
- MOE under AcRF Tier 2 [MOE2015-T2-2-057, MOE2016-T2-2-103, MOE2017-T2-1-162]
- MOE under AcRF Tier 1 [2016T1-002-051, 2017-T1-001-150, 2017-T1-002-119]
- NTU [M4081296.070.500000]
- Agency for Science, Technology and Research (A*STAR) under its AME IRG in Singapore [A1783c0009]
- ITC via Hong Kong Branch of National Precious Metals Material Engineering Research Center
- City University of Hong Kong
The efficiency of splitting water into hydrogen and oxygen is highly dependent on the catalyst used. Herein, ultrathin Ni(0)-embedded Ni(OH)(2) heterostructured nanosheets, referred to as Ni/Ni(OH)(2) nanosheets, with superior water splitting activity are synthesized by a partial reduction strategy. This synthetic strategy confers the heterostructured Ni/Ni(OH)(2) nanosheets with abundant Ni(0)-Ni(II) active interfaces for hydrogen evolution reaction (HER) and Ni(II) defects as transitional active sites for oxygen evolution reaction (OER). The obtained Ni/Ni(OH)(2) nanosheets exhibit noble metal-like electrocatalytic activities toward overall water splitting in alkaline condition, to offer 10 mA cm(-2) in HER and OER, the required overpotentials are only 77 and 270 mV, respectively. Based on such an outstanding activity, a water splitting electrolysis cell using the Ni/Ni(OH)(2) nanosheets as the cathode and anode electrocatalysts has been successfully built. When the output voltage of the electrolytic cell is 1.59 V, a current density of 10 mA cm(-2) can be obtained. Moreover, the durability of Ni/Ni(OH)(2) nanosheets in the alkaline electrolyte is much better than that of noble metals. No obvious performance decay is observed after 20 h of catalysis. This facile strategy paves the way for designing highly active non-precious-metal catalyst to generate both hydrogen and oxygen by electrolyzing water at room temperature.
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