Mechanistic insights into enhanced photocatalytic H₂O₂ production induced by a Z-scheme heterojunction of copper bismuth oxide and molybdenum sulfide

Abstract

Photocatalysts suffer from limited light absorption and rapid electron hole recombination which can be overcome by fabricating a suitable Z-scheme heterojunction. A facile hydrothermal process is employed to synthesize copper...

Improving Charge Carrier Separation through S-Scheme-Based 2D–2D WS2/Sulfur-Doped g-C3N4 Heterojunctions for a Superior Photocatalytic O2 Reduction Reaction

“…These results indicate that e − s and • O 2 − are the foremost active radicals responsible for the photosynthetic production of H 2 O 2 through direct single-step two-electron pathway and indirect successive two-step single-electron transformation pathway processes, respectively. 6,9,14,55 In the indirect pathway, the O 2 molecules get reduced by the photoinduced e − s to • O 2 − species, which then undergoes an uninterrupted reaction with H + and e − s for H 2 O 2 generation through an oxygen reduction reaction. On the other side of the coin, a significant enhancement in H 2 O 2 production was observed in the absence of any scavenging reagent, and this outcome suggests that IPA supplied during the starting of the reaction may get trapped or oxidized by the photoinduced holes in order to provide surplus protons, which are further utilized by the electrons to their maximum potential in the reduction process of dissolved O 2 molecules.…”