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<p>Developing efficient chemical modification technologies for upgrading classic non-noble metal based electrocatalysts to further meet the demands of practical water electrolysis industry is of vital challenge. Here, we propose an organic-inorganic dual-modulation strategy to construct a cobalt hydroxide-based electrocatalyst, MEC-17, synthesized by an eco-friendly and facile microbial-mediated vulcanization method. This electrocatalyst, modified with both 2-methylimidazole and inorganic sulfur exhibits notable oxygen evolution reaction performance, achieving an overpotential of 285.6 ± 1.7 mV and exceeding 300 h of durability at a high current density of 1000 mA&#xa0;cm<sup>−2</sup>. The <i>operando</i> characterizations and theoretical calculations reveal that sulfur dopant primarily shortens the Co−Co distances to support oxide path mechanism, while 2-methylimidazole plays a more critical role by modulating the <i>d</i>-band center of the Co sites, which optimizes intermediate adsorption for ensuring efficient O−O coupling. This work offers insights into the design of organic-inorganic hybrid electrocatalysts and contributes to understanding the origin of their electrocatalytic activities.</p>

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Microbial-vulcanized organic-inorganic dual-modulated cobalt hydroxide for oxygen evolution reaction

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月28日

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  • Jia Zhang,
  • Lu-Yao Guo,
  • Xiao-Qian Lin,
  • Gui-Hua Wen,
  • Xue-Feng Zhang,
  • Li-Hong Yu,
  • Mei-Qian He,
  • Yu-Mei He,
  • Long Zou,
  • Meng-Tian Zhang,
  • Li-Ming Cao,
  • Chun-Ting He

摘要

Developing efficient chemical modification technologies for upgrading classic non-noble metal based electrocatalysts to further meet the demands of practical water electrolysis industry is of vital challenge. Here, we propose an organic-inorganic dual-modulation strategy to construct a cobalt hydroxide-based electrocatalyst, MEC-17, synthesized by an eco-friendly and facile microbial-mediated vulcanization method. This electrocatalyst, modified with both 2-methylimidazole and inorganic sulfur exhibits notable oxygen evolution reaction performance, achieving an overpotential of 285.6 ± 1.7 mV and exceeding 300 h of durability at a high current density of 1000 mA cm−2. The operando characterizations and theoretical calculations reveal that sulfur dopant primarily shortens the Co−Co distances to support oxide path mechanism, while 2-methylimidazole plays a more critical role by modulating the d-band center of the Co sites, which optimizes intermediate adsorption for ensuring efficient O−O coupling. This work offers insights into the design of organic-inorganic hybrid electrocatalysts and contributes to understanding the origin of their electrocatalytic activities.