Construction of highly efficient heterojunction photoanode Vo-Co3O4/Fe2O3 rich in oxygen vacancies for photoelectrochemical water splitting

IF 3.5 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Journal of Solid State Chemistry Pub Date : 2025-08-30 DOI:10.1016/j.jssc.2025.125618

Lijing Zhang , Xihang Zhou , Shasha Yi , Yiyao Zhu , Rui Ding , Yuqi Ji , Yang Sun , Xiao Cheng , Yanting Hu , Tao Hu , Mei Wu

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Abstract

Seeking effective strategies to enhance the photoelectrochemical O₂ evolution activity of Fe₂O₃ photoanode remains a significant challenge due to poor conductivity, rapid recombination of photogenerated charge carriers and sluggish oxygen generation kinetics. Herein, we report the construction of a highly efficient heterojunction photoanode of Vo-Co₃O₄/Fe₂O₃ with rich oxygen vacancies via a combination of electrodeposition and solvothermal methods. The heterojunction formed between Co₃O₄ and Fe₂O₃ could effectively improves the separation efficiency and transfer process of photogenerated charge carriers. Additionally, the oxygen vacancies subsequently introduced by solvent heat treatment could improve the conductivity and lower the oxygen overpotential. As a result, the photocurrent density of Vo-Co₃O₄/Fe₂O₃ photoanode is up to 7.17 mA cm⁻² at 1.23 vs. RHE, which is 358 times higher than that of pristine Fe₂O₃ photoanode (0.02 mA cm⁻²). This substantial enhancement in PEC O₂ evolution activity can be attributed to the synergistic effect of heterojunction construction and the introduction of oxygen vacancies.

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高效富氧空位的Vo-Co3O4/Fe2O3异质结光电阳极的构建

由于Fe2O3光阳极的导电性差、光生载流子的快速重组和氧生成动力学缓慢，寻求有效的策略来增强其光电化学析氧活性仍然是一个重大的挑战。在此，我们报道了通过电沉积和溶剂热相结合的方法，构建了一个具有富氧空位的Vo-Co3O4/Fe2O3的高效异质结光阳极。Co3O4与Fe2O3之间形成的异质结可以有效地提高光生载流子的分离效率和转移过程。此外，溶剂热处理后引入的氧空位可以提高电导率，降低氧过电位。结果表明，在1.23 vs. RHE条件下，Vo-Co3O4/Fe2O3光阳极的光电流密度高达7.17 mA cm - 2，是原始Fe2O3光阳极（0.02 mA cm - 2）的358倍。PEC O2演化活性的显著增强可归因于异质结构建和氧空位的引入的协同效应。

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来源期刊

Journal of Solid State Chemistry 化学-无机化学与核化学

CiteScore

6.00

自引率

9.10%

发文量

848

审稿时长

25 days

期刊介绍： Covering major developments in the field of solid state chemistry and related areas such as ceramics and amorphous materials, the Journal of Solid State Chemistry features studies of chemical, structural, thermodynamic, electronic, magnetic, and optical properties and processes in solids.