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Electrical bias dependence of transient absorption decays probed at 700 nm following excitation at 355 nm of bare (A and C) and treated (B and D) Fe2O3 photoanodes. The right column shows the effect of surface modification of the photoanodes with CoOx (Top, B) and Ga2O3 (Bottom, D). The color code for the applied potentials is shown in Fig. 3A. (VRHE represents the applied potential relative to the reversible hydrogen electrode, RHE).
