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<p>Developing an efficient non-noble metal catalyst to accelerate the oxygen evolution reaction (OER) is essential for enabling the widespread use of electrochemical water splitting. In this work, we proposed a strategy of anion–cation dual doping to fabricate Fe and S dual-doping NiMoO<sub>4</sub> one-dimensional nanorods on nickel foam (Fe-NiMoO<sub>4</sub>-S/NF) through a simple preparation method. The combination of experimental results and theoretical calculations demonstrates that the simultaneous incorporation of both Fe and S can effectively regulate morphology and electronic structure, enhance charge transfer, increase the exposure of active sites, and optimize the adsorption of OER intermediates. The optimized Fe-NiMoO<sub>4</sub>-S/NF reveals excellent OER activity and structure stability, achieving a low overpotentials of 255&#xa0;mV at 50&#xa0;mA&#xa0;cm⁻<sup>2</sup> in alkaline solution (1.0&#xa0;M KOH) and 292&#xa0;mV at 50&#xa0;mA&#xa0;cm⁻<sup>2</sup> in simulated alkaline seawater (1.0&#xa0;M KOH + 0.5&#xa0;M NaCl). Furthermore, the Fe-NiMoO<sub>4</sub>-S/NF maintains robust stability at high current density for 100&#xa0;h and has small Tafel slopes of 66.0 and 78.1&#xa0;mV dec⁻<sup>1</sup> in alkaline solution and simulated alkaline seawater, respectively. In addition, overall water splitting at 10&#xa0;mA&#xa0;cm⁻<sup>2</sup> is achieved with an exceptionally low cell voltage of 1.54&#xa0;V using the Fe-NiMoO<sub>4</sub>-S || Pt/C configuration. Thus, this study provides a significant guideline for the development of non-noble metal OER electrocatalysts through anion–cation dual-doping strategy.</p> Graphical abstract <p>A novel Fe and S dual-doped NiMoO4 one-dimensional nanorods on nickel foam (Fe-NiMoO4-S/NF) were designed for boosting the oxygen evolution reaction activity.</p>

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Anion–cation dual-doping-induced electronic structure modulation of NiMoO4 nanorods for boosting oxygen evolution reaction

  • 期刊论文

  • 发表日期：

    2025年8月24日

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  • Zhou Yu,
  • Qin-Fu Jiang,
  • Sheng-Nan Song,
  • Jin-Shan Liu,
  • Yu-Wei Dong,
  • Yu Ren

摘要

Developing an efficient non-noble metal catalyst to accelerate the oxygen evolution reaction (OER) is essential for enabling the widespread use of electrochemical water splitting. In this work, we proposed a strategy of anion–cation dual doping to fabricate Fe and S dual-doping NiMoO4 one-dimensional nanorods on nickel foam (Fe-NiMoO4-S/NF) through a simple preparation method. The combination of experimental results and theoretical calculations demonstrates that the simultaneous incorporation of both Fe and S can effectively regulate morphology and electronic structure, enhance charge transfer, increase the exposure of active sites, and optimize the adsorption of OER intermediates. The optimized Fe-NiMoO4-S/NF reveals excellent OER activity and structure stability, achieving a low overpotentials of 255 mV at 50 mA cm⁻2 in alkaline solution (1.0 M KOH) and 292 mV at 50 mA cm⁻2 in simulated alkaline seawater (1.0 M KOH + 0.5 M NaCl). Furthermore, the Fe-NiMoO4-S/NF maintains robust stability at high current density for 100 h and has small Tafel slopes of 66.0 and 78.1 mV dec⁻1 in alkaline solution and simulated alkaline seawater, respectively. In addition, overall water splitting at 10 mA cm⁻2 is achieved with an exceptionally low cell voltage of 1.54 V using the Fe-NiMoO4-S || Pt/C configuration. Thus, this study provides a significant guideline for the development of non-noble metal OER electrocatalysts through anion–cation dual-doping strategy.

Graphical abstract

A novel Fe and S dual-doped NiMoO4 one-dimensional nanorods on nickel foam (Fe-NiMoO4-S/NF) were designed for boosting the oxygen evolution reaction activity.