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a) Scheme of the NiO/NiS/QDs photocathode. b) Photocurrent density response to on–off cycles under light illumination at −0.2 V versus Ag/AgCl in a pH = 6.0 buffer solution. c) Current–time curves of NiO/QDs photocathode under light illumination at −0.3 V versus Ag/AgCl in air saturated electrolyte (0.1 m KCl). Reproduced with permission.172 Copyright 2015, American Chemical Society.
