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Abstract <p>An original method for fabricating Ni–Co electrodes is proposed. The electrochemical behavior of the electrodes as the anodes in an alkaline electrolytic cell is studied. It is found that the electrodes exhibit the catalytic activity toward the oxygen evolution reaction, reducing its overpotential. For example, at a current density of 1 A/cm<sup>2</sup> and a temperature of 85°C, the overpotential decreases by 390 mV compared to the Ni electrode. The advantage of the electrodes is the absence of any coating on their surface that can exfoliate during the electrode operation and lead to its irreversible degradation. The Ni–Co electrodes are tested in the 6 M KOH solution at a temperature of 85°C and a current density of 300 mA/cm<sup>2</sup>, i.e., under the conditions as close as possible to the operating conditions for the alkaline electrolyzers for 500 h. It is shown that after the tests, the electrode surface remained with no visible signs of degradation such as cracking, exfoliation and other mechanical damage. At the same time, a small but irreversible increase of the voltage is observed in the current–voltage characteristics, which may indicate a decrease of the catalytic properties of the electrode surface.</p>

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Ni–Co-Based Electrodes for Oxygen Evolution Reaction in Alkaline Water Electrolysis

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • V. N. Kuleshov,
  • S. V. Kurochkin,
  • N. V. Kuleshov,
  • M. A. Klimova,
  • O. Yu. Grigorieva

摘要

Abstract

An original method for fabricating Ni–Co electrodes is proposed. The electrochemical behavior of the electrodes as the anodes in an alkaline electrolytic cell is studied. It is found that the electrodes exhibit the catalytic activity toward the oxygen evolution reaction, reducing its overpotential. For example, at a current density of 1 A/cm2 and a temperature of 85°C, the overpotential decreases by 390 mV compared to the Ni electrode. The advantage of the electrodes is the absence of any coating on their surface that can exfoliate during the electrode operation and lead to its irreversible degradation. The Ni–Co electrodes are tested in the 6 M KOH solution at a temperature of 85°C and a current density of 300 mA/cm2, i.e., under the conditions as close as possible to the operating conditions for the alkaline electrolyzers for 500 h. It is shown that after the tests, the electrode surface remained with no visible signs of degradation such as cracking, exfoliation and other mechanical damage. At the same time, a small but irreversible increase of the voltage is observed in the current–voltage characteristics, which may indicate a decrease of the catalytic properties of the electrode surface.