期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 139, 期 37, 页码 12927-12930出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b07606
关键词
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资金
- U.S. Department of Energy Office of Science [DE-SC0004993]
- U.S. Department of Energy Office of Science, Office of Basic Energy Sciences [DE-AC02-76SF00515]
- Office of Biological and Environmental Research
- NIH [P41GM103393]
- National Science Foundation
Transition metal phosphides exhibit high catalytic activity toward the electrochemical hydrogen-evolution reaction (HER) and resist chemical corrosion in acidic solutions. For example, an electrodeposited CoP catalyst exhibited an overpotential, eta, of -eta < 100 mV at a current density of -10 mA cm(-2) in 0.500 M H2SO4(aq). To obtain a chemical description of the material as-prepared and also while effecting the HER in acidic media, such electrocatalyst films were investigated using Raman spectroscopy and X-ray absorption spectroscopy both ex situ as well as under in situ and operando conditions in 0.500 M H2SO4(aq). Ex situ analysis using the tandem spectroscopies indicated the presence of multiple ordered and disordered phases that contained both near-zerovalent and oxidized Co species, in addition to reduced and oxygenated P species. Operando analysis indicated that the active electrocatalyst was primarily amorphous and predominantly consisted of near-zerovalent Co as well as reduced P.
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