关键词: 复合材料, 光催化, S型异质结, 二氧化碳

Abstract:

In this study, a hierarchical Bi/PANI/CeO₂ photocatalytic system was successfully constructed via electrospinning combined with a solvothermal method. This system forms a unique S-scheme heterojunction structure through in-situ loading of Bi nanoparticles and CeO₂ nanocubes on PANI nanofibers. Multidimensional characterization results demonstrate that Bi/PANI/CeO₂ exhibits superior CO₂ reduction performance under simulated sunlight: after 3 h of irradiation, CO and CH₄ production rates reached 12.38 μmol·g^-¹·h^-¹ and 4.86 μmol·g^-¹·h^-¹, respectively, significantly surpassing pure PANI nanofibers(CO: 0.48 μmol·g^-¹·h^-¹; CH₄: 0.54 μmol·g^-¹·h^-¹) with 26-fold and 9-fold enhancements. The catalyst retained 90% of its initial activity after fifteen cycles. The material achieves efficient photogenerated carrier separation via S-scheme band alignment, while surface plasmon resonance(SPR) of Bi nanoparticles synergistically activates electrons and induces active sites, providing dual driving forces for CO₂ reduction. This research not only offers a novel strategy for designing high-efficiency photocatalysts but also provides critical theoretical support and technical references for mitigating the greenhouse effect and advancing the “dual carbon” goal through CO₂ resource utilization pathways.

Key words: composites, photocatalytic, S-scheme heterojunction, carbon dioxide