Magnetic field-enhanced photoelectrochemical water splitting of Co3O4/TiO2 for efficient oxygen evolution

IF 6.8 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Science China Materials Pub Date : 2024-08-02 DOI:10.1007/s40843-024-3029-5

Ze-En Zhou (, ), Yi Lu (, ), Yi-Xuan Liu (, ), Shang Cao (, ), Ge Tian (, ), Zhi-Yi Hu (, ), Ling Shen (, ), Si-Ming Wu (, ), Jie Ying (, ), Wei Geng (, ), Xiao-Yu Yang (, )

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Abstract

Effective separation of photogenerated carriers plays a vital role in governing the efficiency of photo-electrocatalytic reactions. However, the advancement in enhancing the intrinsic carrier separation efficiency of semiconductors has shown limited progress. Herein, we reported the use of a magnetic field to improve the photoelectrochemical water splitting of a magnetic Co₃O₄/TiO₂ photoanode by boosting the photogenerated carrier separation efficiency. In the presence of the magnetic field, oxygen evolution reaction occurs with a high photocurrent density of 0.86 mA cm⁻² at 1.23 V versus V_RHE, and an applied bias photon-to-current efficiency of 0.342% at 0.61 V_RHE. Moreover, the photoanode maintains its oxygen evolution reaction for more than 400 h with photocurrent decays by ca. 10%. Observations made in this effort show that the enhancement of photo-electrocatalytic efficiency by a magnetic field is a consequence of the effect of the Lorentz force generated by the magnetic field on photogenerated carriers and ions near the Co₃O₄/TiO₂ photoanode, which improves the carrier separation efficiency and the bubble release rate. The results suggest that manipulating photoelectrode carriers by using a magnetic field is a promising strategy to design high-performance photoelectrochemical for water splitting.

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磁场增强 Co3O4/TiO2 的光电化学水分离，实现高效氧气进化

光生载流子的有效分离对光电催化反应的效率起着至关重要的作用。然而，提高半导体固有载流子分离效率的研究进展有限。在此，我们报告了利用磁场通过提高光生载流子分离效率来改善磁性 Co3O4/TiO2 光阳极的光电化学水分离。在磁场作用下，氧进化反应在 1.23 V 对 VRHE 的电压下以 0.86 mA cm-2 的高光电流密度发生，在 0.61 VRHE 的电压下，应用偏压光子对电流的效率为 0.342%。此外，光阳极的氧进化反应可维持 400 小时以上，光电流衰减约 10%。观察结果表明，磁场对光电催化效率的提高是磁场对 Co3O4/TiO2 光阳极附近光生载流子和离子产生的洛伦兹力作用的结果，这种作用提高了载流子分离效率和气泡释放率。研究结果表明，利用磁场操纵光电极载流子是设计用于水分离的高性能光电化学器件的一种很有前途的策略。

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来源期刊

Science China Materials Materials Science-General Materials Science

CiteScore

11.40

自引率

7.40%

发文量

949

期刊介绍： Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.