Hydrogen peroxide (HO) artificial photosynthesis converts low-density solar energy into storable clean chemical energy, which is an important hot topic in green chemistry. Constructing heterojunctions is an effective tactic to enhance the oxygen reduction kinetics of HO photosynthesis, however, the actual source of activity remains ambiguous. Here, a series of BiVO@ZnInS hierarchical heterojunctions (BZ-, = 0.4, 0.8, 1.2) were elegantly designed through piecing two-dimensional (2D) BiVO nanosheets onto the surface of three-dimensional (3D) ZnInS flower-like microspheres by a straightforward ethanol ultrasound-induced self-assembly strategy. These BZ- photocatalysts exhibit significantly enhanced photocatalytic HO production rates across a wide pH range (3-13) compared with those of pristine BiVO and ZnInS, with the optimal BZ-0.8 showing an excellent photocatalytic HO production rate as high as 1585.99 μmol g h. Comprehensive analysis reveals that 2D BiVO nanosheets and 3D ZnInS flower-like microspheres form a Z-scheme hierarchical heterojunction, which can deliver a favorable energy coupling between photogenerated electrons and the chemical adsorption of O at the interface of hierarchical heterojunctions, thereby accelerating the two-step one-electron kinetic process. This study provides a new perspective for improving photocatalytic HO production by introducing hierarchical heterojunction strategies.
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