Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 15, Issue 40, Pages 17460-17467Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3cp52981a
Keywords
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Funding
- Office of Science of the U.S. Department of Energy [DE-SC0004993]
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Resonant inelastic X-ray scattering and high-resolution X-ray absorption spectroscopy were used to identify the chemical state of a Co electrocatalyst in situ during the oxygen evolution reaction. After anodic electrodeposition onto Au(111) from a Co2+-containing electrolyte, the chemical environment of Co can be identified to be almost identical to CoOOH. With increasing potentials, a subtle increase of the Co oxidation state is observed, indicating a non-stoichiometric composition of the working OER catalyst containing a small fraction of Co4+ sites. In order to confirm this interpretation, we used density functional theory with a Hubbard-U correction approach to compute X-ray absorption spectra of model compounds, which agree well with the experimental spectra. In situ monitoring of catalyst local structure and bonding is essential in the development of structure-activity relationships that can guide the discovery of efficient and earth abundant water splitting catalysts.
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