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Abstract <p>Bismuth vanadate (BiVO<sub>4</sub>) is highly studied for its potential in photoelectrochemical (PEC) water splitting, but its effectiveness is reduced by the rapid recombination of photogenerated carriers on the surface. This study presents a straightforward approach to integrating CuCo<sub>2</sub>O<sub>4</sub> with BiVO<sub>4</sub> to form a <i>p</i>–<i>n</i> junction, substantially enhancing the separation of electron-hole pairs on electrode surfaces. The photoelectrode BiVO<sub>4</sub>/CuCo<sub>2</sub>O<sub>4</sub>, which was prepared with an optimal CuCo<sub>2</sub>O<sub>4</sub> loading, achieved a significant photocurrent density of 1.26 mA/cm<sup>2</sup> at a potential of 1.23 V relative to the reversible hydrogen electrode (RHE). Experimental investigations confirmed that the presence of CuCo<sub>2</sub>O<sub>4</sub> enhances the mobility and separation of photogenerated electron-hole pairs. The outstanding performance in PEC water splitting demonstrated by the CuCo<sub>2</sub>O<sub>4</sub>/BiVO<sub>4</sub> composite electrode suggests its excellent suitability for applications involving solar-assisted water splitting.</p>

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Fabrication of a BiVO4/CuCo2O4 Heterojunction Photoanode for Photoelectrochemical Water Splitting

  • 期刊论文

  • 发表日期：

    2025年3月27日

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  • D. Wenfei,
  • X. Yonglei

摘要

Abstract

Bismuth vanadate (BiVO4) is highly studied for its potential in photoelectrochemical (PEC) water splitting, but its effectiveness is reduced by the rapid recombination of photogenerated carriers on the surface. This study presents a straightforward approach to integrating CuCo2O4 with BiVO4 to form a p–n junction, substantially enhancing the separation of electron-hole pairs on electrode surfaces. The photoelectrode BiVO4/CuCo2O4, which was prepared with an optimal CuCo2O4 loading, achieved a significant photocurrent density of 1.26 mA/cm2 at a potential of 1.23 V relative to the reversible hydrogen electrode (RHE). Experimental investigations confirmed that the presence of CuCo2O4 enhances the mobility and separation of photogenerated electron-hole pairs. The outstanding performance in PEC water splitting demonstrated by the CuCo2O4/BiVO4 composite electrode suggests its excellent suitability for applications involving solar-assisted water splitting.