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Photocurrent measurement. (A) Photocurrent-potential characteristics of ZnO (black) and ZnO/Co-based catalyst electrodes (gray) measured (scan rate, 10 mV/s) with chopped light (100 mW/cm2, 1Hz). Arrows indicate the onset potential of photocurrent. Photocurrent of ZnO (black) and ZnO/Co-based catalyst electrodes (gray) measured at (B) 0.0 V and (C) 0.2 V against the Ag/AgCl reference electrode.
