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

摘要：

通过静电纺丝技术结合溶剂热法，成功构建了具有分级结构的Bi/PANI/CeO₂三元协同催化体系。该体系通过PANI纳米纤维原位构建Bi纳米粒子与CeO₂纳米立方体，形成独特的S型异质结构。多维度表征结果表明，Bi/PANI/CeO₂在模拟太阳光下表现出优异的CO₂还原性能；光照3 h后，CO和CH₄生成速率分别达到12.38 μmol·g^-¹·h^-¹和4.86 μmol·g^-¹·h^-¹，显著优于纯PANI纳米纤维（CO：0.48 μmol·g^-¹·h^-¹；CH₄：0.54 μmol·g^-¹·h^-¹），实现了26倍和9倍的性能提升，且15次循环后性能保持率达90%。该材料通过S型异质结能带匹配机制实现光生载流子的高效分离，同时Bi纳米粒子的表面等离子体共振（SPR）效应协同激活电子并诱导活性位点，为CO₂还原提供双重驱动力。本研究不仅为设计高效光催化剂提供了新策略，更通过CO₂资源化利用路径，为缓解温室效应、推动“双碳”目标的实现提供了重要理论支撑与技术参考。

关键词: 复合材料, 光催化, S型异质结, 二氧化碳