Jump to main content
Jump to site search

Issue 40, 2013
Previous Article Next Article

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

Author affiliations

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 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.

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

Back to tab navigation

Supplementary files

Publication details

The article was received on 16 Jul 2013, accepted on 05 Sep 2013 and first published on 05 Sep 2013


Article type: Paper
DOI: 10.1039/C3CP52981A
Citation: Phys. Chem. Chem. Phys., 2013,15, 17460-17467
  •   Request permissions

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

    D. Friebel, M. Bajdich, B. S. Yeo, M. W. Louie, D. J. Miller, H. Sanchez Casalongue, F. Mbuga, T. Weng, D. Nordlund, D. Sokaras, R. Alonso-Mori, A. T. Bell and A. Nilsson, Phys. Chem. Chem. Phys., 2013, 15, 17460
    DOI: 10.1039/C3CP52981A

Search articles by author

Spotlight

Advertisements