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Chloride Oxidation as an Alternative to the Oxygen-Evolution Reaction on H x WO 3 Photoelectrodes

Oxidizing chloride anion to chlorine or hypochlorous acid in water shows 100% current efficiency on H x WO 3 photoelectrodes. Water oxidation is less than 90% efficient in strong acid and gets worse as the solution becomes less acidic. Accordingly, oxidizing chloride leads to a stable photocurrent, indicating that the catalysis is sustainable for long periods without degrading the H x WO 3 material.

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