异质结
光催化
半导体
费米能级
电场
氧化还原
材料科学
电极
还原(数学)
光电子学
电化学
化学
纳米技术
电子
物理
催化作用
无机化学
物理化学
数学
量子力学
生物化学
几何学
作者
Hanqiu Jiang,Xun Hu,Xiaohui Yu,Lijuan Sun,Jinhe Li,Juan Yang,Qinqin Liu
标识
DOI:10.1016/j.cej.2023.143129
摘要
Manipulating the built-in electric field (BEF) is a crucial challenge in the development of efficient photocatalysts, especially for S-scheme heterojunction. Herein, a precisely regulation of the BEF intensity of an S-scheme heterojunction was realized by adjusting the oxygen vacancy (OV) content of the composed oxidation semiconductor (WO3-x nanosheets). When a moderate OV content was created in WO3-x, its Fermi level migrated down to the lowest position, resulting in the largest difference in Fermi level with the reduction semiconductor of NH2-MIL-125(Ti)(NM), and thus, the strongest BEF-driven NM/WO3-x S-scheme heterojunction was formed. The augmented BEF improved charge separation and transfer, and the S-scheme mode retained high redox ability. As a result, an efficient simultaneous production of CO (12.57 μmol⋅g−1⋅h−1) and H2O2 (8.41 μmol⋅g−1⋅h−1) from CO2 and H2O in the absence of any electron/hole sacrificial agent was achieved, which was 8.01 and 6.62 times higher compared to that of NM, respectively. This work throws inspiration for regulating BEF to enhance the carrier separation and achieve the simultaneous production from photocatalytic CO2 reduction.
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