Preparation of Z-scheme hetero-structure Co-doped BiFeO3/BiVO4 film photoanode for photoelectrochemical water splitting

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL Applied Surface Science Pub Date : 2025-07-15 Epub Date: 2025-03-19 DOI:10.1016/j.apsusc.2025.162961

Xingang Kong, Hao Tian, Xinmiao Yang, Guoyu Ren, Jianfeng Huang, Lixiong Yin, Hao Zhang

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Abstract

The Co-doped BiFeO₃/BiVO₄ composite photoanode was successfully synthesized via the sol–gel method. The surface work function of BiFeO₃ was modified by doping Co³⁺ ions, resulting in the formation of a Z-scheme Co-BiFeO₃/BiVO₄ hetero-structure. In this hetero-structure, the photogenerated carriers were not only able to effectively separated, but also the high oxidation capacity of BiVO₄ and the high reduction of Co-BiFeO₃ retained. And the direction of the spatial electric field on the BiVO₄ surface aligned with the electric field on the Co-BiFeO₃/BiVO₄ interface, which enhanced the separation of photogenerated carriers and promoted the photogenerated hole migration forward the surface of photoanode. As a result, the Z-scheme Co-BiFeO₃/BiVO₄ composite photoanode exhibited strong photoelectrochemical performance compared with BiFeO₃/BiVO₄ composite photoanode.

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Z-scheme异质结构共掺杂BiFeO3/BiVO4薄膜光阳极的制备

采用溶胶-凝胶法制备了共掺杂BiFeO3/BiVO4复合光阳极。通过掺杂Co3+离子修饰BiFeO3的表面功函数，形成Z-scheme Co-BiFeO3/BiVO4异质结构。在这种异质结构中，光生载体不仅能够有效分离，而且还保留了BiVO4的高氧化能力和Co-BiFeO3的高还原能力。并且BiVO4表面空间电场方向与Co-BiFeO3/BiVO4界面电场方向一致，增强了光生载流子的分离，促进了光生空穴向光阳极表面的迁移。结果表明，与BiFeO3/BiVO4复合光阳极相比，Z-scheme Co-BiFeO3/BiVO4复合光阳极表现出较强的光电电化学性能。

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.