The traditionally proposed oxygen evolution reaction (OER) mechanism involves four-concerted proton–electron transfer steps at metal centers on the catalyst surfaces, which produces oxygen atoms derived from the electrolyte. This results in pH-independent activity on the reversible hydrogen electrode (RHE) scale. However, recent studies have shown several cases that the electrochemical reactions can be pH-dependent. Using LaFexCo1-xO3 (0≦x≦1) catalysts as model systems we have explored the effects of dopant concentration in KOH electrolyte with different pH values. The combination of in situ X-ray scattering and spectroscopy as well as electrochemical performance tests provides insights to revise the reaction mechanism for OER and oxygen reduction reaction.

The role of dopant concentration and electrolyte pH on the performance of LaFexCo1-xO3 catalysts for oxygen reduction/evolution reaction

256th National Meeting (2018)

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