Constructing S-scheme PDPB/Ag–TiO2 heterojunctions with a powerful internal electric field for facilitating photocatalytic hydrogen evolution
S-scheme heterojunction catalysts have attracted much attention due to their ability to effectively separate photo-generated electrons and holes while optimizing the redox ability of carriers. We have prepared an efficient visible-light catalytic PDPB/Ag–TiO 2 S-scheme heterojunction by in-situ synthesis methods . The catalysts were characterized for their structure, composition , morphology, and photoelectrochemical properties. The hydrogen production rate of PDPB/Ag–TiO 2 -2 was 1473.6 μmol/g/h. The results of SPV analysis showed that the spontaneous interfacial charge transfer from PDPB to Ag–TiO 2 in the contact interface region resulted in the presence of an internal electric field . This enhanced internal electric field effectively drove directional charge migration through the S-scheme mechanism, improving charge separation and utilization. The PDPB/Ag–TiO 2 -2 composites also maintained stable photocatalytic activity after running for four cycles. Overall, this study brings fresh preparation ideas for the conjugated polymer-TiO 2 composites with high photocatalytic efficiency.
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