介孔材料
X射线光电子能谱
纳米晶
异质结
材料科学
光催化
纳米技术
肖特基势垒
电子能带结构
费米能级
载流子
光电子学
电子
化学
物理
核磁共振
催化作用
凝聚态物理
量子力学
二极管
生物化学
作者
Zhongliang Dong,Jiaxin Zhou,Zhijie Zhang,Ying Jiang,Rui Zhou,Chunxia Yao
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2022-08-04
卷期号:5 (8): 10076-10085
被引量:30
标识
DOI:10.1021/acsaem.2c01760
摘要
Construction of a p–n heterojunction is an efficient strategy to promote interfacial carrier transportation and photocatalytic reaction. Herein, we report the fabrication of a p–n heterojunction by incorporating CsPbBr3 nanocrystals into a mesoporous Cu2O microsphere. The band structures of n-type CsPbBr3 and p-type Cu2O were analyzed by UV–vis absorption spectra, Mott-Schottky plots, and valence-band X-ray photoelectron spectra (VB-XPS). The results showed that CsPbBr3 and Cu2O have staggered band alignments, and the Fermi level (EF) of Cu2O is much lower than that of CsPbBr3. Based on these analyses, an S-scheme charge-transfer mechanism was proposed, which was validated by XPS and electron spin resonance (ESR) measurements. The CsPbBr3/Cu2O heterostructure showed enhanced CO2 photoreduction activity compared to the single counterparts, which could be attributed to the unique porous structure, efficient charge separation, and preservation of highly energetic electrons. This p–n heterostructure is expected to be a potential visible-light-driven photocatalyst for artificial photosynthesis.
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