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Oxygen vacancy-induced modulation of the built-in electric field of TiO 2-α /WO 3-δ for enhanced CO 2 photoreduction
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| 【文章作者】Huang, Shuyu;Wang, Jinsong;Bao, Rui;Yi, Jianhong;Liu, Liang;Kong, Xin |
| 【文章摘要】 Inefficient light absorption and rapid charge recombination pose significant challenges in limiting the efficacy of CO2 photoreduction. In this work, we developed TiO2-alpha/WO3-delta heterojunctions with precisely tunable oxygen vacancies (OVs) as a catalyst for photocatalytic CO2 reduction to CO. The TiO2-alpha/WO3-delta heterojunction demonstrated remarkable performance, yielding 28.11 mu mol g(-1) h(-1) of CH4 4 and 22.19 mu mol g(-1) h(-1) of CO, representing 18.6-fold and 3.9-fold increases, respectively, compared to unreduced samples. The introduction of OVs creates a new defect energy level in the photocatalyst, inducing localized electron enrichment. This modulates the bandgap and enhances the built-in electric field (BEF) intensity. The optimized bandgap expands the light absorption range, while the enhanced BEF effectively suppresses carrier recombination, collectively improving the photocatalytic CO2 reduction activity. |
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【卷】【ISSUE】【ISSUEID】
【文章期份】2024
【发布日期】2025/5/13 10:04:15
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