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(a) Photocurrent density of the photocathodes vs the applied voltage. (b) Prolonged J–t curves of the photocathodes at a bias potential of 0 V vs RHE. Adapted with permission from ref (234). Copyright 2018 Royal Society of Chemistry. (c) Chopped photocurrent density comparison of photoanodes with or without a TiO2 layer. Adapted with permission from ref (148). Copyright 2016 Royal Society of Chemistry.
