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Friebel D, Bajdich M, Yeo BS, et al. On the chemical state of Co oxide electrocatalysts during alkaline water splitting. Phys Chem Chem Phys. 2013;15(40):17460-7doi: 10.1039/c3cp52981a.
Friebel, D., Bajdich, M., Yeo, B. S., Louie, M. W., Miller, D. J., Sanchez Casalongue, H., Mbuga, F., Weng, T. C., Nordlund, D., Sokaras, D., Alonso-Mori, R., Bell, A. T., & Nilsson, A. (2013). On the chemical state of Co oxide electrocatalysts during alkaline water splitting. Physical chemistry chemical physics : PCCP, 15(40), 17460-7. https://doi.org/10.1039/c3cp52981a
Friebel, Daniel, et al. "On the chemical state of Co oxide electrocatalysts during alkaline water splitting." Physical chemistry chemical physics : PCCP vol. 15,40 (2013): 17460-7. doi: https://doi.org/10.1039/c3cp52981a
Friebel D, Bajdich M, Yeo BS, Louie MW, Miller DJ, Sanchez Casalongue H, Mbuga F, Weng TC, Nordlund D, Sokaras D, Alonso-Mori R, Bell AT, Nilsson A. On the chemical state of Co oxide electrocatalysts during alkaline water splitting. Phys Chem Chem Phys. 2013 Oct 28;15(40):17460-7. doi: 10.1039/c3cp52981a. PMID: 24026021.
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Phys Chem Chem Phys. 2013 Oct 28;15(40):17460-7. doi: 10.1039/c3cp52981a.

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

Physical chemistry chemical physics : PCCP

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

Affiliations

  1. Joint Center for Artificial Photosynthesis, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. [email protected].

PMID: 24026021 DOI: 10.1039/c3cp52981a

Abstract

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 Co(2+)-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 Co(4+) 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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