10%CoO/g-C 3N 4 exhibits good photocatalytic performance under visible light irradiation without any sacrificial reagents.
Using photocatalysts to split water into hydrogen and oxygen is a promising way to produce renewable energy. Efficient and stable photocatalysts are desired for overall water splitting under visible light. We demonstrate that the cobalt( ii) oxide (CoO)/graphitic carbon nitride (CoO/g-C 3N 4) composites synthesized by a one-step thermal decomposition method exhibit enhanced photocatalytic efficiency for overall water splitting without sacrificial reagents. 10%CoO/g-C 3N 4 exhibits optimal photocatalytic performance, where H 2 and O 2 evolution rates are, respectively, 0.46 μmol h −1 and 0.21 μmol h −1 under visible light irradiation without any sacrificial reagents. It is worth mentioning that the H 2 and O 2 production almost approaches the stoichiometric ratio 2 : 1. The enhanced photocatalytic activity of CoO/g-C 3N 4 may be ascribed to the efficient charge separation and fast decomposition of H 2O 2 by CoO.
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