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

IF 3.2 4区化学 Q3 CHEMISTRY, PHYSICAL Electrocatalysis Pub Date : 2026-06-28 DOI:10.1007/s12678-026-01053-w

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

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Abstract

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.

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不同基质上负载的钌镧氧化物阴极催化剂在碱水电解中反复启动和关闭操作中的耐久性

在双极碱性电解中，由于停机时的反向电流导致的电催化剂降解是一个严重的问题。在这项研究中，研究了在重复启动/关闭（SU/SD）操作过程中，由于反向电流，衬底材料对商用钌镧系氧化物阴极催化剂降解的影响。根据SU/SD操作前后电解液和阴极的光谱和质量数据，讨论了催化剂降解的原因。在Ni衬底的情况下，在SU/SD操作的最初200次循环中，析氢反应（HER）的电流密度迅速下降。相比之下，对于Ti衬底，在最初的200次循环中，HER电流密度下降了~ 20%，然后稳定下来。Ru组分在Ni和Ti衬底上的漏出率分别约为99%和27%。这些结果表明，在重复SU/SD操作过程中，催化剂的降解是由两种底物的催化剂脱落引起的，Ti底物有效地抑制了降解。图形抽象

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来源期刊

Electrocatalysis CHEMISTRY, PHYSICAL-ELECTROCHEMISTRY

CiteScore

4.80

自引率

6.50%

发文量

审稿时长

>12 weeks

期刊介绍： Electrocatalysis is cross-disciplinary in nature, and attracts the interest of chemists, physicists, biochemists, surface and materials scientists, and engineers. Electrocatalysis provides the unique international forum solely dedicated to the exchange of novel ideas in electrocatalysis for academic, government, and industrial researchers. Quick publication of new results, concepts, and inventions made involving Electrocatalysis stimulates scientific discoveries and breakthroughs, promotes the scientific and engineering concepts that are critical to the development of novel electrochemical technologies. Electrocatalysis publishes original submissions in the form of letters, research papers, review articles, book reviews, and educational papers. Letters are preliminary reports that communicate new and important findings. Regular research papers are complete reports of new results, and their analysis and discussion. Review articles critically and constructively examine development in areas of electrocatalysis that are of broad interest and importance. Educational papers discuss important concepts whose understanding is vital to advances in theoretical and experimental aspects of electrochemical reactions.