Hierarchical hollow structured BiOBr-Pt catalysts for photocatalytic CO2 reduction
BiOBr-Pt catalysts with hierarchical hollow structures were synthesized by a one-step solvothermal meth-od using ethylene glycol as solvent and polyvinylpyrrolidone as surfactant.The synthesized hierarchical hollow structure BiOBr-2h catalyst had a specific surface area of 28 m2·g-1,twice as large as the comparison sample BiOBr-1h.This structure provides more reactive sites for the catalytic reaction.Meanwhile,introducing Pt into the catalyst can enhance the carrier conduction rate of BiOBr.Moreover,it can act as an electron trap to capture many surround-ing electrons and inhibit the complexation of photogenerated carriers,thus improving the catalytic activity of CO2 re-duction.The main product of BiOBr-Pt was CO with 99％product selectivity and its CO yield was 20.8 μmol·h-1·g-1.Its performance was 2.1 times that of primitive BiOBr.This Pt loading with a hierarchical hollow structure can effectively convert CO2.
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