Twin S-Scheme g-C 3 N 4 /CuFe 2 O 4 /ZnIn 2 S 4 Heterojunction with a Self-Supporting Three-Phase System for Photocatalytic CO 2 Reduction: Mechanism Insight and DFT Calculations

The use of photocatalytic solar energy to drive CO2 reduction is beneficial for addressing fossil fuel shortages and environmental pollution issues. We synthesized a twin S-scheme g-C3N4/CuFe2O4/ZnIn2S4 heterojunction, which was used to construct a self-supporting three-phase system for photocatalytic CO2 reduction. Two built-in electric fields in this heterojunction induced effective migration of photogenerated carriers, resulting in a wide light response range and strong oxidation ability. This twin S-scheme photocatalytic system without a sacrificial agent had high CH4 selectivity (96.8%) and surprise production rate of CH4 (267.4 μmol g–1 h–1), and still maintained an excellent cycle rate (249–267.4 μmol…

• NN
  National Natural Science Foundation of China

  Award: 51806080
• DO
  Department of Science and Technology of Jilin Province

  Awards: 20230202113NC, 20220202103NC
• NK
  National Key Research and Development Program of China

  Award: 2021YFD1500105-3