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Multimetallic oxyhydroxides are highly active electrocatalysts for water oxidation but their mechanism and the role of each metal is poorly understood. Here, authors use spectroelectrochemical techniques to probe the species accumulated during catalysis in Ni/Fe oxyhydroxide films.

Understanding reaction mechanisms in heterogeneous (photo)electrochemical catalysts is key to improving solar-to-fuel conversion efficiencies. Here the authors compare the mechanism of hydrogen evolution on ruthenium oxide as an electrocatalyst and as part of a photocathode via an optical/electrochemical approach.

An amendment to this paper has been published and can be accessed via a link at the top of the paper.