Figure 13.

a) Schematic diagram of a photo‐electrochemical cell, consisting of a photocathode with a cobaloxime catalyst anchored to the CdSe QD‐sensitized NiO film on a FTO glass substrate, a Ag/AgCl reference electrode, and a Pt wire as counter electrode for water splitting. b) Transient current responses of the photocathodes made using the one‐pot adsorption and reaction (OPAR) procedure to the on–off cycles of illumination at 0 V versus NHE in a three‐electrode PEC cell in 0.1 m Na₂SO₄ solution (pH 6.8). c) Curves of photocurrent density versus time for the prepared porous NiO‐based photocathodes over 3.5 h illumination at an applied potential of 0.2 V. Reproduced with permission.168 Copyright 2015, Royal Society of Chemistry.