Semiconductor photocatalysis is deemed as a novel and promising process that can produce HO from earth-abundant water and gaseous dioxygen using sunlight as the energy supply. The searching of novel catalysts for photocatalytic HO production has received increasing attention in the last few years. Herein, size-controlled growth of ZnSe nanocrystals was realized a solvothermal method by varying the amount of Se and KBH. The performance of the as-obtained ZnSe nanocrystals towards photocatalytic HO production depends on the mean size of the synthesized nanocrystals. Under O-bubbling, the optimal ZnSe sample presented an excellent HO production efficiency (8.596 mmol g h), and the apparent quantum efficiency for HO production reaches as high as 2.84% at = 420 nm. Under air-bubbling, the accumulation of HO was as high as 1.758 mmol L after 3 h irradiation at the ZnSe dosage of 0.4 g L. The photocatalytic HO production performance is far superior to the most investigated semiconductors such as TiO, g-CN, and ZnS.
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