In-Situ Synchronous Photoelectrosynthesis of H2o2/Hclo Green Disinfectant with a S-Scheme Heterojunction Bifunctional In2s3/Mnin2s4 Photoelectrocatalyst

Photoelectrosynthesis of H2O2/HClO green disinfectant have great potential, although it is still a big challenge to develop effective catalysts. We develop a S-scheme heterojunction In2S3/MnIn2S4 hollow hierarchical tube based on ion exchange as bifunctional catalyst that can drive O2 reduction reaction (ORR) on hydrophobic In2S3/MnIn2S4/PVDF/NF photocathode and Cl- oxidation reaction (ClOR) on hydrophilic In2S3/MnIn2S4/CP photoanode, accumulating practically useful concentrations of H2O2/HClO up to 2108 μmol·L-1/28.5 mg·L-1 with Faraday efficiencies of 65.3%/60%, respectively. With a two-electrode O2/Cl- co-photoelectrocatalysis system, H2O2 and HClO can be simultaneously generated in H-type cell with a lower voltage by replacing OER with ClOR. In single-chamber cell, the synergistic effect of co-produced H2O2 and HClO presented to generate 1O2 and more ·OH by activation of HClO and H2O2 at electrode, resulting high-efficiency degradation of organic pollutants. This work provides a win-win strategy for simultaneous production of H2O2 and HClO, efficient pollutant degradation for environmental and energy engineering.