光致发光
材料科学
异质结
光催化
光谱学
载流子
半导体
漫反射红外傅里叶变换
氧化还原
紫外线
催化作用
光电子学
光化学
化学
物理
量子力学
冶金
生物化学
作者
Amr Sabbah,Indrajit Shown,Mohammad Qorbani,Fang‐Yu Fu,Tsung-Chih Lin,Heng‐Liang Wu,Po‐Wen Chung,Chih-I Wu,Svette Reina Merden Santiago,Ji‐Lin Shen,Kuei‐Hsien Chen,Li‐Chyong Chen
出处
期刊:Nano Energy
[Elsevier]
日期:2022-03-01
卷期号:93: 106809-106809
被引量:108
标识
DOI:10.1016/j.nanoen.2021.106809
摘要
Employing direct Z-scheme semiconductor heterostructures in photocatalysis offers efficient charge carrier separation and isolation of both redox reactions, thus beneficial to reduce CO2 into solar fuels. Here, a ZnS/ZnIn2S4 heterostructure, comprising cubic ZnS nanocrystals on hexagonal ZnIn2S4 (ZIS) nanosheets, is successfully fabricated in a single-pot hydrothermal approach. The composite ZnS/ZnIn2S4 exhibits microstrain at its interface with an electric field favorable for Z-scheme. At an optimum ratio of Zn:In (~ 1:0.5), an excellent photochemical quantum efficiency of around 0.8% is reached, nearly 200-fold boost compared with pristine ZnS. Electronic levels and band alignments are deduced from ultraviolet photoemission spectroscopy and UV-Vis. Evidence of the direct Z-scheme and carrier dynamics is verified by photo-reduction experiment, along with photoluminescence (PL) and time-resolved PL. Finally, diffuse-reflectance infrared Fourier transformed spectroscopy explores the CO2 and related intermediate species adsorbed on the catalyst during the photocatalytic reaction. This microstrain-induced direct Z-scheme approach opens a new pathway for developing next-generation photocatalysts for CO2 reduction.
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