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<p>Efficient, low-cost, and durable electrocatalysts are critical for the oxygen evolution reaction (OER) in alkaline water electrolysis. Ni<sub><i>x</i></sub>CoFe electrodes with varying Ni content were prepared on nickel mesh by simple and economical atmosphere plasma spraying (APS). The surface morphology, elemental composition, and electrochemical performance of the Ni<sub><i>x</i></sub>CoFe electrodes were evaluated. These results show that many coral reef structures were observed on the Ni<i>ₓ</i>CoFe electrodes. The flower cluster structures were identified in Ni<sub>3</sub>CoFe, further enhancing the active surface area. Electrochemical analysis demonstrated that the Ni<sub>3</sub>CoFe electrode exhibited superior OER catalytic performance, achieving a low overpotential of 92&#xa0;mV at a current density of 100&#xa0;mA·cm<sup>−2</sup> and a Tafel slope of 122.63&#xa0;mV·dec<sup>−1</sup> in 1&#xa0;M KOH, attributed to the coral reef and flower cluster structures. The investigation provides a scalable and cost-effective Ni<sub>3</sub>CoFe anodal electrode via APS for industrial application.</p>

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Efficient Ni3CoFe electrodes via atmosphere plasma spraying for electrocatalytic oxygen evolution reaction

  • 期刊论文

  • 发表日期：

    2025年8月16日

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  • Xionghui Gui,
  • Qinqin Chen,
  • Hailong Hu,
  • Qinhao Zhang,
  • Lu Ren,
  • Xinkun Suo

摘要

Efficient, low-cost, and durable electrocatalysts are critical for the oxygen evolution reaction (OER) in alkaline water electrolysis. NixCoFe electrodes with varying Ni content were prepared on nickel mesh by simple and economical atmosphere plasma spraying (APS). The surface morphology, elemental composition, and electrochemical performance of the NixCoFe electrodes were evaluated. These results show that many coral reef structures were observed on the NiₓCoFe electrodes. The flower cluster structures were identified in Ni3CoFe, further enhancing the active surface area. Electrochemical analysis demonstrated that the Ni3CoFe electrode exhibited superior OER catalytic performance, achieving a low overpotential of 92 mV at a current density of 100 mA·cm−2 and a Tafel slope of 122.63 mV·dec−1 in 1 M KOH, attributed to the coral reef and flower cluster structures. The investigation provides a scalable and cost-effective Ni3CoFe anodal electrode via APS for industrial application.