In-situ deposition of metal Bi on BiOBr/CdS S-scheme heterojunction for effective photocatalytic H2O2 evolution via a two channel pathway

Photocatalytic H2O2 evolution from H2O and O2 has drawn growing attention, however, most current photocatalytic systems require the addition of sacrificial reagents to elevate the production activity. In this work, an efficient Bi/BiOBr-CdS S-scheme heterojunction was succeed synthesis via solvothermal method and exhibits a high H2O2 production activity of 346.4 mu mol center dot L-1 center dot h-1 via H2O oxidation accompanying with O2 reduction reactions. It is indicated that in synergistic effect of S-scheme heterojunction and metal Bi can reduce band gap, facilitate separation of charge carriers and induce high formation rate constants of H2O2. These works provide new strategies and ideas for the design of a S-scheme heterojunction to maximize redox ability.(c) 2023 Elsevier B.V. All rights reserved.

Automated summary

Photocatalytic H2O2 evolution from H2O and O2 has gained increasing attention. This study successfully synthesized an efficient Bi/BiOBr-CdS S-scheme heterojunction via solvothermal method, which exhibits a high H2O2 production activity of 346.4 μmol/L/h through H2O oxidation and O2 reduction reactions. The synergistic effect of S-scheme heterojunction and metal Bi reduces the band gap, facilitates charge carrier separation, and induces high formation rate constants of H2O2. These findings provide new strategies and ideas for maximizing the redox ability of S-scheme heterojunctions.