期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 125, 期 31, 页码 17008-17018出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.1c03646
关键词
-
资金
- U.S. Department of Energy, Office of Science, Basic Energy Sciences, Catalysis Science Program [DE-SC0018408]
- National Energy Research Scientific Computing Center, an Office of Science User Facility - U.S. Department of Energy [DE-AC02-05CH11231]
- U.S. National Science Foundation [DMR-1904636, OIA-1541079, OIA-1946231]
- Louisiana Board of Regents
- Chevron Innovative Research Support Fund of LSU
- U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Science & Engineering Division
- U.S. Department of Energy [DE-AC02-07CH11358]
- U.S. Department of Energy (DOE) [DE-SC0018408] Funding Source: U.S. Department of Energy (DOE)
Research has shown that the partially oxidized surface of quaternary HEA based on base metals is more active for the electrochemical hydrogen evolution reaction in acidic solutions, surpassing the individual component metals.
High-entropy alloys (HEAs) have intriguing material properties, but their potential as catalysts has not been widely explored. Based on a concise theoretical model, we predict that the surface of a quaternary HEA of base metals, CoCrFeNi, should go from being nearly fully oxidized except for pure Ni sites when exposed to O-2 to being partially oxidized in an acidic solution under cathodic bias, and that such a partially oxidized surface should be more active for the electrochemical hydrogen evolution reaction (HER) in acidic solutions than all the component metals. These predictions are confirmed by electrochemical and surface science experiments: the Ni in the HEA is found to be most resistant to oxidation, and when deployed in 0.5 M H2SO4, the HEA exhibits an overpotential of only 60 mV relative to Pt for the HER at a current density of 1 mA/cm(2).
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据