In2O3/Bi19Br3S27 S-scheme heterojunction with enhanced photocatalytic CO2 reduction

异质结 材料科学 光催化 氧化剂 氧化还原 热液循环 半导体 催化作用 还原(数学) 化学工程 傅里叶变换红外光谱 载流子 光电子学 纳米技术 化学 生物化学 几何学 数学 有机化学 工程类 冶金
作者
Yuqin Bian,Houwei He,Graham Dawson,Jinfeng Zhang,Kai Dai
出处
期刊:Science China. Materials [Springer Science+Business Media]
卷期号:67 (2): 514-523 被引量:11
标识
DOI:10.1007/s40843-023-2725-y
摘要

In recent years, semiconductor catalysts have attracted lots of attention due to their substantial redox capability and adequate stability. However, many semiconductor catalysts have difficulties in realizing real word applications because of the high complexation and low oxidizing ability of photogenerated electron-holes. In-depth investigation has revealed that the S-scheme heterojunction possesses a unique mechanism of carrier movement, resulting in a robust redox capacity and strong driving force. Herein, we synthesized an In2O3/Bi19Br3S27 step-scheme (S-scheme) heterojunction through the hydrothermal method comprised of Bi19Br3S27 nanoflowers grown on In2O3 nanospheres. This configuration effectively facilitates the separation and transfer of photogenerated charge carriers. As a result, the reduction yield of CO2 by In2O3/Bi19Br3S27 composite reaches 28.36 µmol h−1 g−1, which is 19 times higher than that of In2O3 and 3.5 times higher than that of Bi19Br3S27. Furthermore, the intermediates involved in the photocatalytic reaction were examined through in situ diffuse reflectance infrared Fourier transform spectroscopy, revealing the reaction process of photocatalytic reduction of CO2. This work offers a concept on the method of constructing S-scheme heterojunction photocatalysts to enhance the catalyzed reduction of CO2.
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