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<p>In bipolar alkaline water electrolysis, electrocatalyst degradation due to a reverse current during shutdown is a serious problem. In this study, the effect of the substrate material on the degradation of commercial Ru–lanthanide oxide cathode catalysts due to a reverse current during repeated startup/shutdown (SU/SD) operations was investigated. The causes of catalyst degradation were discussed based on spectroscopic and mass data of the electrolyte and cathode before and after SU/SD operation. In the case of the Ni substrate, the current density for the hydrogen evolution reaction (HER) decreased rapidly during the initial 200 cycles of SU/SD operations. In contrast, for the Ti substrate, the HER current density decreased by ~ 20% in the initial 200 cycles and then stabilized. The dropout ratios of the Ru component on the Ni and Ti substrates were approximately 99% and 27%, respectively. These results demonstrated that catalyst degradation during repeated SU/SD operations was caused by catalyst dropout from both substrates, and the Ti substrate was effective in suppressing the degradation.</p> Graphical Abstract <p></p>

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Durability of Ru–Lanthanide Oxide Cathode Catalysts Supported on Different Substrates during Repeated Startup and Shutdown Operations in Alkaline Water Electrolysis

  • 期刊论文

  • 发表日期：

    2026年6月28日

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  • Eiji Higuchi,
  • Teruaki Miyake,
  • Tomohiro Higashida,
  • Masanobu Chiku,
  • Akihiro Kato,
  • Zaenal Awaludin,
  • Yoshinori Nishiki,
  • Hiroshi Inoue

摘要

In bipolar alkaline water electrolysis, electrocatalyst degradation due to a reverse current during shutdown is a serious problem. In this study, the effect of the substrate material on the degradation of commercial Ru–lanthanide oxide cathode catalysts due to a reverse current during repeated startup/shutdown (SU/SD) operations was investigated. The causes of catalyst degradation were discussed based on spectroscopic and mass data of the electrolyte and cathode before and after SU/SD operation. In the case of the Ni substrate, the current density for the hydrogen evolution reaction (HER) decreased rapidly during the initial 200 cycles of SU/SD operations. In contrast, for the Ti substrate, the HER current density decreased by ~ 20% in the initial 200 cycles and then stabilized. The dropout ratios of the Ru component on the Ni and Ti substrates were approximately 99% and 27%, respectively. These results demonstrated that catalyst degradation during repeated SU/SD operations was caused by catalyst dropout from both substrates, and the Ti substrate was effective in suppressing the degradation.

Graphical Abstract