Disordered metal oxides have emerged as important features in heterogeneous electrocatalysts for the oxygen evolution reaction (OER). Insights into how the short-range structure of this ill-defined class of materials affects the electrochemical behavior and electrocatalytic performance will be provided through analysis of structure-property relationships on a contiguous series of disordered Fe-Co oxides. X-ray absorption fine-structure spectroscopy results provide evidence for a composition-dependent distribution of di-μ-oxo bridged cobalt-cobalt, di- μ -oxo bridged cobalt-iron and corner-sharing cobalt structural motifs in the composition series. Electrochemical techniques and time-resolved <i>in-situ</i> X-ray absorption spectroelectrochemistry provide parameters that describe the electrochemical behavior and the electrocatalytic performance. Comparison of the structural model with (spectro)electrochemical data reveals relationships across the composition series that provide evidence for two distinct reaction sites for OER and identify both direct and indirect modes-of-action for iron ions in the mixed-metal compositions.

Spectroscopic analysis of active sites for electrocatalytic water oxidation in disordered iron-cobalt oxides

255th National Meeting (2018)

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