Building S-Scheme p-n Junction by the In Situ Sulfidation of Cu-TCPP Toward Boosted Photocatalytic Activity for CO2 Photoreduction and Sterilization

In this work, an S-type p-n junction is designed and fabricated by in situ interfacial sulfidation of Cu-TCPP. Due to the combination of in situ derived CuS, the light absorption expanded to the full-solar-light spectrum, with expected thermal effect and exponentially increased electrical conductivity. The co-shared Cu atoms inspired intimate atomic-level contact and strong electron cooperation to formulate the high-speed electron/heat transfer channel. The formed O─Cu─S bonds up-shifted the Fermi level at the interface of Cu-TCPP and induced an extra driven force for electron extraction, suppressing the recombination of photogenerated carriers. The CO product yield over CuS-3 can reach 693.51 µmol g⁻¹ h⁻¹ with the increased selectivity of 99.23%. Considering the enhanced photothermal conversion and oxidation capacity, it could also eradicate 99.99% of S. aureus under simulated solar light. The outperformed self-healing and bio-compatible property is undercovered in the wound treatment. This high-efficiency photocharges, coupled with the “greenhouse” effect at high-quality interface, has stimulated the exploitation of other similar material assemblies.