超快激光光谱学
异质结
载流子
光致发光
光催化
电荷(物理)
X射线光电子能谱
化学物理
光谱学
材料科学
光化学
吸收(声学)
光电子学
化学
化学工程
物理
有机化学
催化作用
复合材料
量子力学
工程类
作者
Linxi Wang,Jianjun Zhang,Huogen Yu,İmren Hatay Patır,Youji Li,S. Wageh,Ahmed A. Al‐Ghamdi,Yuanyuan Wang
标识
DOI:10.1021/acs.jpclett.2c01332
摘要
Step-scheme heterojunctions formed between two firmly bound photocatalysts facilitate charge separation due to interfacial charge transfer, which is usually illustrated by the gain or loss of electrons in the constituent photocatalysts characterized by in situ irradiated X-ray photoelectron spectroscopy. This technique provides a steady-state view of charge distribution but overlooks the transient and complex dynamics of charge transfer, trapping, and recombination. To provide a molecular-level and dynamic view of these processes, we investigated the behaviors of photogenerated charge carriers within an inorganic/organic TiO2/polydopamine S-scheme heterojunction using ultrafast transient absorption spectroscopy and time-resolved photoluminescence spectroscopy. We found the interfacial charge transfer within the step-scheme heterojunction occurred at a smaller shorter time scale than recombination, leading to efficient charge separation. Moreover, the charge-discharge property of polydopamine induces electron backflow, which should be avoided in practical photocatalytic applications. The composite showed higher photocatalytic H2O2-production activities due to faster H2O2 formation and suppressed H2O2 decomposition.
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