异质结
选择性
光催化
X射线光电子能谱
电子顺磁共振
材料科学
钙钛矿(结构)
光化学
吸收(声学)
漫反射红外傅里叶变换
光谱学
吸收光谱法
量子产额
吸附
化学
光电子学
催化作用
化学工程
物理化学
光学
核磁共振
有机化学
荧光
物理
复合材料
量子力学
工程类
作者
Zhenzong Zhang,Meiyang Wang,Zexu Chi,Wenjie Li,Han Yu,Nan Yang,Hongbing Yu
标识
DOI:10.1016/j.apcatb.2022.121426
摘要
This study focuses on improving photocatalytic CO2 reduction reaction (CRR) activity and modulating product selectivity. An In4SnS8/Cs3Bi2Br9-X (ISS/CBB-X) heterojunction is prepared using novel lead-free Cs3Bi2Br9 perovskite quantum dot–modified In4SnS8, which shows considerable potential as photocatalysts for CRRs under visible light. The optimised ISS/CBB photocatalyst exhibits high activity and CO selectivity with a CO yield and selectivity of 9.55 μmol g−1 h−1 and 92.9%, respectively, 3.8 and 1.5 times higher than those of pristine ISS, respectively. Moreover, the step-scheme (S-scheme) mechanism can be fully confirmed via in situ irradiated X-ray photoelectron spectroscopy, in situ electron spin resonance, femtosecond time-resolved absorption spectroscopy and density functional theory calculations. Based on in situ diffuse reflectance spectra and theoretical investigations, the ISS/CBB shows a decreased energy barrier towards CO2 reduction to CO through an adsorbed ⁕COOH intermediate. This study contributes to the further understanding of fabricating efficient S-scheme-based photocatalysts for selective CRR.
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