Dual built-in spontaneous electric fields in an S-scheme heterojunction for enhanced photocatalytic H2O2 production†
Abstract
Hydrogen peroxide production using solar energy is of great significance because it can ameliorate the energy crisis and environmental pollution. Bismuth vanadate (BiVO4) is a promising photocatalyst, but the sluggish oxygen reduction reaction (ORR) limits its H2O2 production. In this study, a step-scheme (S-scheme) heterojunction with tightly coupled interfaces consisting of BiVO4 and Cu2O was prepared by a photodeposition method, and a MnOOH cocatalyst was modified on the BiVO4 surface. The MnOOH/BiVO4/Cu2O photocatalyst exhibited an outstanding H2O2-generation performance of 112 μmol L−1 h−1 in pure water. The increased H2O2-evolution activity was ascribed to the formation of dual built-in spontaneous electric fields in the S-scheme heterojunction, which significantly promoted the dual directed charge transfer in the bulk phase of single-crystal BiVO4 and the interface of the S-scheme heterojunction. This study offers valuable insights for constructing promising S-scheme photocatalysts for H2O2 generation.
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