Water Oxidation and Degradation Mechanisms of BiVO<sub>4</sub> Photoanodes in Bicarbonate Electrolytes.

Starting with the E oc dark condition, we find a clear trend in the dark chemical etching rate as a function of electrolyte pH, with considerably larger rates observed in the pH 8.5 unbuffered KHCO 3 electrolyte (0.1 nm/min), compared to the pH 7.5 buffered KHCO 3 (0.03 nm/min) and the pH 6.8 buffered KPi (0.01 nm/min).

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