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<p>The sluggish kinetics of the oxygen evolution reaction (OER) process impedes the exploration of green hydrogen via water splitting. Herein, we design and synthesize vanadium-doped CoSn(OH)<sub>6</sub> perovskite hydroxide catalysts by Fe<sup>3+</sup> etching during the hydrothermal and chemical deposition process. The as-prepared CoVSn(OH)<sub>6</sub>@CoVSnFe(OH)<sub><i>x</i></sub>−4 catalyst exhibits a low overpotential of 225&#xa0;mV at 10&#xa0;mA·cm<sup>−2</sup> with a Tafel slope of 30.47&#xa0;mV·dec<sup>−1</sup>. An overall water splitting electrolyzer (CoVSn(OH)<sub>6</sub>@CoVSnFe(OH)<sub><i>x</i></sub>−4 || Pt/C) is constructed, delivering a voltage of 1.48&#xa0;V at a current density of 10&#xa0;mA·cm<sup>−2</sup> with excellent durability. The dynamic phase evolution during the OER process is revealed by in situ Raman and XPS measurement, which represents that the introduced V and Fe ions facilitate the formation of active CoOOH as well as modify the electronic structure of the catalyst. Density functional theory (DFT) calculations further evidence that V and Fe introduction optimize the adsorption energies of oxygen intermediates *OH and *O, respectively, thereby enabling a synergistic optimization of the multi-step OER process and advancing electrocatalytic performance.</p> Graphical abstract <p></p>

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Iron and vanadium in perovskite hydroxide enabling the relay catalysis for oxygen evolution

  • 期刊论文

  • 发表日期：

    2025年3月15日

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  • Qi-Ming Sun,
  • Wei-Gao Zhong,
  • Yu-Xiao Liu,
  • Hua Wang,
  • Yu-Ling Zhai,
  • Jin-Song Wang,
  • Xiang Ao,
  • Kong-Zhai Li,
  • Zhi-Shan Li,
  • Chun-Dong Wang

摘要

The sluggish kinetics of the oxygen evolution reaction (OER) process impedes the exploration of green hydrogen via water splitting. Herein, we design and synthesize vanadium-doped CoSn(OH)6 perovskite hydroxide catalysts by Fe3+ etching during the hydrothermal and chemical deposition process. The as-prepared CoVSn(OH)6@CoVSnFe(OH)x−4 catalyst exhibits a low overpotential of 225 mV at 10 mA·cm−2 with a Tafel slope of 30.47 mV·dec−1. An overall water splitting electrolyzer (CoVSn(OH)6@CoVSnFe(OH)x−4 || Pt/C) is constructed, delivering a voltage of 1.48 V at a current density of 10 mA·cm−2 with excellent durability. The dynamic phase evolution during the OER process is revealed by in situ Raman and XPS measurement, which represents that the introduced V and Fe ions facilitate the formation of active CoOOH as well as modify the electronic structure of the catalyst. Density functional theory (DFT) calculations further evidence that V and Fe introduction optimize the adsorption energies of oxygen intermediates *OH and *O, respectively, thereby enabling a synergistic optimization of the multi-step OER process and advancing electrocatalytic performance.

Graphical abstract