期刊
APPLIED SURFACE SCIENCE
卷 479, 期 -, 页码 1254-1261出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2019.01.258
关键词
Electrocatalysts; Phosphide; Electronic state; Hydrogen evolution reaction; Oxygen evolution reaction
类别
资金
- National Key Research and Development Program of China [2016YFB0701100]
- National Natural Science Foundation of China [51802015]
- Fundamental Research Funds for the Central Universities [FRF-BD-17-013A]
- Beijing Organization Department [2017000020124G090]
The development of high-efficiency nonprecious electrocatalysts based on inexpensive and earth abundant elements is of great significance for renewable energy technologies. Here, Co-tuned nickel phosphide electrocatalysts have been prepared by a facile co-precipitation, oxidation, and phosphidation method by regulating the atomic ratio of Co/Ni. Co species could modulate the electronic state behaviors of NixPy and the hierarchically nanostructured Ni/Co-P shows highly electrochemical activity with a small Tafel slope of 45 mV dec(-1) and an overpotential of 148 mV to reach the current density of 10 mA cm(-2) in 0.5 M H2SO4 for hydrogen evolution reaction (HER). In 1.0 M KOH, an overpotential of 360 mV is required to achieve the current density of 10 mA cm(-2) for oxygen evolution reaction (OER). Our research results suggest that doping metal is a useful route to improve the catalytic activity and our method may open up facile avenues to design other catalysts.
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