异质结
光合作用
电荷(物理)
方案(数学)
载流子
光电子学
材料科学
人工光合作用
物理
化学
生物
植物
数学
量子力学
光催化
数学分析
生物化学
催化作用
作者
Feiyan Xu,Ying He,Jianjun Zhang,Guijie Liang,Chengyuan Liu,Jiaguo Yu
标识
DOI:10.1002/anie.202414672
摘要
S‐scheme heterostructure photocatalysts, distinguished by unique charge‐transfer pathways and exceptional catalytic redox capabilities, have found widespread applications in addressing challenging chemical processes, including the photocatalytic reduction of CO2 with a high reaction barrier. Nevertheless, the influence of intraband defect levels within S‐scheme heterojunctions on charge separation, carrier lifetime, and surface catalytic reactions has, for the most part, been overlooked. Herein, we develop a tunable defect‐level‐assisted strategy to construct an electron reservoir, effectively prolonging the lifetime of charge carriers through the rapid capture and gradual release of photoelectrons within WO3‐x/In2S3 S‐scheme heterojunctions, as authenticated by femtosecond transient absorption spectroscopy and theoretical simulations. The surface photoredox mechanism, unraveled by Gibbs free energy calculations, demonstrates that oxygen‐vacancy‐induced defect states in WO3‐x/In2S3 heterojunctions unlock the rate‐determining H2O oxidation into free oxygen molecules by forming metastable oxygen intermediates, contributing to the facilitation of H2O photooxidation. This distinct role, combined with the extended carrier lifetime, results in boosted CO2 photoreduction with nearly 100% CO selectivity in the absence of any photosensitizer or scavenger. Our work sheds light on the role of controllable defect levels in governing charge transfer dynamics within S‐scheme heterojunctions, thereby inspiring the development of more advanced photocatalysts for artificial photosynthesis.
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