Impact of Organic Anions on Metal Hydroxide Oxygen Evolution Catalysts

Shujin Hou, Lili Xu, Soumya Mukherjee, Jian Zhou, Kun Ting Song, Zhenyu Zhou, Shengli Zhang, Xiaoxin Ma, Julien Warnan, Aliaksandr S. Bandarenka, Roland A. Fischer

Research output: Contribution to journalArticlepeer-review

Abstract

Structural metamorphosis of metal-organic frameworks (MOFs) eliciting highly active metal-hydroxide catalysts has come to the fore lately, with much promise. However, the role of organic ligands leaching into electrolytes during alkaline hydrolysis remains unclear. Here, we elucidate the influence of organic carboxylate anions on a family of Ni or NiFe-based hydroxide type catalysts during the oxygen evolution reaction. After excluding interfering variables, i.e., electrolyte purity, Ohmic loss, and electrolyte pH, the experimental results indicate that adding organic anions to the electrolyte profoundly impacts the redox potential of the Ni species versus with only a negligible effect on the oxygen evolution activities. In-depth studies demonstrate plausible reasons behind those observations and allude to far-reaching implications in controlling electrocatalysis in MOFs, mainly where compositional modularity entails fine-tuning organic anions.

Original languageEnglish
Pages (from-to)12074-12081
Number of pages8
JournalACS Catalysis
Volume14
Issue number16
DOIs
Publication statusPublished - 16 Aug 2024

Keywords

  • electrocatalysis
  • metal hydroxides
  • metal−organic frameworks
  • organic anions
  • oxygen evolution reaction

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