期刊
NANO LETTERS
卷 19, 期 1, 页码 530-537出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b04466
关键词
Nickel-iron hydroxide; surface reconstruction; OER; electrocatalysis; nanostructure
类别
资金
- U.S. National Science Foundation [CMMI-1663509]
- Rice University
- College of Engineering, Iowa State University, United States
The oxygen-evolution reaction (OER) is a key process in water-splitting systems, fuel cells, and metal-air batteries, but the development of highly active and robust OER catalyst by simple methods is a great challenge. Here, we report an in situ dynamic surface self-reconstruction that can dramatically improve the catalytic activity of electrocatalysts. A fluoride (F-)-incorporating NiFe hydroxide (NiFe-OH-F) nanosheet array was initially grown on Ni foam by a one-step hydrothermal method, which requires a 243 mV over-potential (eta) to achieve a 10 mA cm(-2) current density with a Tafel slope of 42.9 mV dec(-1) in alkaline media. After the surface self-reconstruction induced by fluoride leaching under OER conditions, the surface of NiFe-OH-F was converted into highly mesoporous and amorphous NiFe oxide hierarchical structure, and the OER activity at eta = 220 mV increases over 58-fold. The corresponding eta at 10 mA cm(-2) decreases to 176 mV with an extreme low Tafel slope of 22.6 mV dec(-1); this performance is superior to that of the state-of-the-art OER electrocatalysts.
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