F− surface modified ZnO for enhanced photocatalytic H2O2 production and its fs-TAS investigation

F− surface modified ZnO for enhanced photocatalytic H2O2 production and its fs-TAS investigation

Pure ZnO exhibits low photocatalytic H2O2 production activity due to the rapid charge recombination. To realize the spatial separation of photogenerated electrons and holes, constructing an electron transfer channel on the ZnO surface is an effective approach. This study successfully modified the su...

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Bibliographic Details
Main Authors: Xin Zhou, Chenbin Ai, Xiaojing Wang, Zhen Wu, Jianjun Zhang
Format: Article
Language:English
Published: Elsevier 2025-05-01
Series:Journal of Materiomics
Subjects:
Femtosecond transient absorption spectroscopy
Hydrogen peroxide production
Electron quenching dynamics
Interfacial electron transfer
Electron transfer mechanism
Online Access:http://www.sciencedirect.com/science/article/pii/S2352847824002132
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Summary:Pure ZnO exhibits low photocatalytic H2O2 production activity due to the rapid charge recombination. To realize the spatial separation of photogenerated electrons and holes, constructing an electron transfer channel on the ZnO surface is an effective approach. This study successfully modified the surface of ZnO using F− (ZnO/F) by introducing NH4F in an aqueous phase photocatalytic system. The F− is adsorbed on the ZnO surface by Coulombic force and significantly improves the photocatalytic H2O2 production performance of ZnO, with the highest efficiency of 4137.2 μmol⋅g−1·L−1·h–1. The photocatalytic performance enhancement mechanism of ZnO/F is explained in terms of electron transfer dynamics by femtosecond transient absorption spectroscopy (fs-TAS) measurements. F− surface modification constructs a new ultrafast electron transport pathway from the ZnO CB to F−, and the optimal ZnO/F exhibits the fastest interfacial electron transfer lifetime of 5.8 ps. The F− surface modification effectively facilitates the charge separation, thereby increasing the number of electrons available for photocatalytic H2O2 reaction. This study has revealed the roles of F− surface modification in the photocatalytic H2O2 production by ZnO and provides guidance for ionic modification to improve photocatalytic performance.
ISSN:2352-8478

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