On the chemical state of Co oxide electrocatalysts during alkaline water splitting

Friebel, Daniel; Bajdich, Michal; Yeo, Boon Siang; Louie, Mary W.; Miller, Daniel J.; Sanchez Casalongue, Hernan; Mbuga, Felix; Weng, Tsu-Chien; Nordlund, Dennis; Sokaras, Dimosthenis; Alonso-Mori, Roberto; Bell, Alexis T.; Nilsson, Anders

doi:10.1039/c3cp52981a

Title: On the chemical state of Co oxide electrocatalysts during alkaline water splitting

Journal Article · Thu Sep 05 00:00:00 EDT 2013 · Physical Chemistry Chemical Physics. PCCP

DOI:https://doi.org/10.1039/c3cp52981a· OSTI ID:1570978

Friebel, Daniel ^[1]; Bajdich, Michal ^[2]; Yeo, Boon Siang ^[3]; Louie, Mary W. ^[2]; Miller, Daniel J. ^[4]; Sanchez Casalongue, Hernan ^[1]; Mbuga, Felix ^[4]; Weng, Tsu-Chien ^[5]; Nordlund, Dennis ^[5]; Sokaras, Dimosthenis ^[5]; Alonso-Mori, Roberto ^[6]; Bell, Alexis T. ^[2]; Nilsson, Anders ^[1]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Joint Center for Artificial Photosynthesis; SLAC National Accelerator Lab., Menlo Park, CA (United States). SUNCAT Center for Interface Science and Catalysis
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Joint Center for Artificial Photosynthesis; Univ. of California, Berkeley, CA (United States). Dept. of Chemical and Biomolecular Engineering
Univ. of California, Berkeley, CA (United States). Dept. of Chemical and Biomolecular Engineering
SLAC National Accelerator Lab., Menlo Park, CA (United States). SUNCAT Center for Interface Science and Catalysis
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource
SLAC National Accelerator Lab., Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)

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. Finally, 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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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: AC02-05CH11231

OSTI ID:: 1570978

Journal Information:: Physical Chemistry Chemical Physics. PCCP, Vol. 15, Issue 40; ISSN 1463-9076

Publisher:: Royal Society of Chemistry

Country of Publication:: United States

Language:: English

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