期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 122, 期 2, 页码 864-870出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcb.7b06953
关键词
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资金
- Office of Science, Office of Basic Energy Science (BES), of the U.S. Department of Energy (DOE) [DE-SC0004993]
- Office of Science, Office of Basic Energy Sciences, of the U.S. DOE [DE-AC02-05CH11231]
- Linus Pauling Distinguished Post-Doctoral Fellowship Pacific Northwest National Laboratory (PNNL, Laboratory Directed Research and Development Program) [69319]
Understanding the surface chemistry of electro-catalysts in operando can bring insight into the reaction mechanism, and ultimately the design of more efficient materials for sustainable energy storage and conversion. Recent progress in synchrotron based X-ray spectroscopies for in operando characterization allows us to probe the solid/liquid interface directly while applying an external potential, applied here to the model system of Pt in alkaline electrolyte for the hydrogen evolution reaction (HER). We employ ambient pressure X-ray photoelectron spectroscopy (AP-XPS) to identify the oxidation and reduction of Pt-oxides and hydroxides on the surface as a function of applied potential, and further assess the potential for hydrogen adsorption and absorption (hydride formation) during and after the HER This new window into the surface chemistry of Pt in alkaline electrolyte brings insight into the nature of the rate limiting step, the extent of H ad/absorption, and its persistence at more anodic potentials.
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