Strain-Induced Photocatalytic H2 Production over BiVO4 in Pure Water without Any Cocatalyst

文献类型： 外文期刊

第一作者： Lu, Xiaoxiao

作者： Lu, Xiaoxiao;Wang, Xiangge;Zheng, Shifan;Zhao, Xiaojing;Xu, Wentao;Pan, Xiaoyang;Si, Ruiru;Yi, Zhiguo

作者机构：

期刊名称：LANGMUIR （ 影响因子：3.7； 五年影响因子：3.5 ）

ISSN： 0743-7463

年卷期： 2024 年 40 卷 33 期

页码：

收录情况： SCI

摘要： In this study, BiVO4 nanosheets (BiVO4-NS) were prepared by a facile hydrothermal method. It is found that sonication-induced strain can effectively promote the H-2 production over BiVO4-NS in the presence of pure water without any cocatalysts. With the assistance of the sonication, the H-2 production over BiVO4-NS is 1.344 mmolg(-1) after 3 h simulated sunlight irradiation, which is 24.8 times higher than that of BiVO4-NS without sonication (0.054 mmolg(-1)). In addition, the products of water oxidation are determined to be hydroxyl radicals and hydrogen peroxide. Moreover, BiVO4-NS also shows obviously enhanced photoactivity than that of the commercially available BiVO4 nanoparticles (BiVO4-C). The improved photoactivity of BiVO4-NS is attributed to the effective charge separation and low charge transfer resistance. The underlying mechanism of sonication-promoted water splitting is investigated by a variety of controlled experiments. The results show that ultrasonic waves can produce obvious strain inside the sample, which results in lattice distortion of BiVO4. Therefore, the conduction band of BiVO4 is obviously negative shifted, which is beneficial for H-2 production. In addition, the strain in BiVO4 also produces local polarization of the sample, which effectively promotes the charge transfer and separation process. It is hoped that our study could provide a new strategy for achieving efficient photocatalytic water splitting.

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