講演情報
[17a-P01-14]Achieving High Selectivity for CO2 Reduction to CH4 through Photothermal-Photocatalysis with Topological Bi2Se3 and ZnIn2S4 Photocatalysts
〇(D)JiaMao Chang1, TingHan Lin1, YinHsuan Chang1, MingChung Wu1 (1.Chang Gung Univ.)
キーワード：
photocatalytic CO2 reduction、photothermal effect、ZnIn2S4
Photothermal catalytic CO2 reduction represents a promising strategy for solar energy utilization and greenhouse gas mitigation. This approach employs hybrid photocatalysts that convert absorbed photons into heat energy through non-radiative relaxation processes, thereby lowering activation energy and enhancing catalytic efficiency. In this study, we report that Bi2Se3/ZnIn2S4 composite significantly enhance the photothermal catalytic activity and selectivity for CO2 methanation under simulated sunlight. The optimized catalyst achieves a CO2 methanation rate of 3.64 μmol·g-1·h-1 with 91.0% CH4 selectivity. Temperature-dependent photoluminescence spectra reveals that the Bi2Se3/ZnIn2S4 photocatalyst exhibits a relatively low exciton binding energy compared to ZnIn2S4. This suggests that the Bi2Se3/ZnIn2S4 effectively dissociates excitons into free carriers, enhancing charge transfer and resulting in superior photocatalytic activity. Concurrently, in-situ irradiated XPS confirms that the heterostructure facilitates carrier transfer, with electrons migrating from ZnIn2S4 to Bi2Se3. The introduction of Bi2Se3, with its inherent topological surface states, enhances non-radiative relaxation and induces localized surface plasmon resonance, thereby promoting the photothermal effect.