Developing new efficient catalyst materials for the oxygen evolution reaction (OER) is essential for widespread proton exchange membrane water electrolyzer use. Both RuO(110) and IrO(110) have been shown to be highly active OER catalysts, however DFT predictions have been unable to explain the high activity of RuO. We propose that this discrepancy is due to RuO utilizing a different reaction pathway, as compared to the conventional IrO pathway. This hypothesis is supported by comparisons between experimental data, DFT data and the proposed reaction model.
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