异质结
材料科学
X射线光电子能谱
光催化
硝基苯
量子点
载流子
氧化还原
制氢
工作职能
分解水
可逆氢电极
纳米技术
光化学
化学工程
光电子学
氢
电化学
催化作用
电极
物理化学
化学
工作电极
生物化学
有机化学
图层(电子)
工程类
冶金
作者
Yuan Lin,Chen Lv,Jianhua Zhang,Yunyun Gui,Lijun Liu
标识
DOI:10.1016/j.jmst.2023.06.064
摘要
Solar energy conversion and high-value chemical production are of utmost importance. However, the development of efficient photocatalysts with strong redox ability remains challenging. Here we report a unique 3D/0D In2S3/WO3 S-scheme heterojunction photocatalyst obtained by depositing WO3 quantum dots (QDs) onto hierarchical In2S3 microflowers. The In2S3/WO3 composite exhibits outstanding visible light absorption, with a maximum optical response of up to 600 nm. The electronic interaction and charge separation at interfaces are explored by in situ X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) calculations. The difference in work function causes In2S3 to donate electrons to WO3 upon combination, leading to the formation of an internal electric field (IEF) at the interfaces. Due to the IEF and bent energy bands, the transfer and separation of photogenerated charge carriers follow an S-scheme pathway within In2S3/WO3. Owing to the strong redox ability, spatial charge separation and lower H2-generation barrier of S active sites, the optimized In2S3/WO3 heterojunctions show enhanced photocatalytic hydrogen evolution of 0.39 mmol h–1 g–1, 6.7 times that of pristine In2S3. In addition, the In2S3/WO3 S-scheme heterojunctions afford a remarkable activity for photocatalytic nitrobenzene hydrogenation with nearly 98% conversion and 99% selectivity of aniline within 1 h. Our work might present new insights into developing efficient S-scheme heterojunctions for various photocatalytic applications.
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