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<p>Understanding electrochemical hydrogen evolution reaction (HER) mechanisms requires precise identification of key intermediates (H*, OH*, and H<sub>2</sub>O*). While in situ single-crystal studies have provided foundational mechanistic insights into interfacial dynamics and intermediate behavior during the HER, extending these findings to structurally complex nano-catalysts remains challenging. Recent advances in in situ characterization techniques have enabled real-time observation of reaction intermediates, yet a systematic understanding across diverse catalyst architectures remains incomplete. This review assesses HER intermediate research, bridging the gap from model single-crystals to nano-catalysts by: (i) discussing methods for intermediate identification and their roles in elucidating HER mechanisms, (ii) summarizing single-crystal surface modification strategies bridging single-crystal model and nano-catalyst studies, and (iii) highlighting current challenges and proposing future directions for catalyst design and intermediate characterization, offering valuable perspectives for developing advanced HER electrocatalysts.</p><p></p>

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In Situ Probing of Electrochemical Hydrogen Evolution Reaction Intermediates: From Single-Crystal Models to Nano-Catalysts

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月6日

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  • Zhen Zhang,
  • Xing Chen,
  • Jian-Hui Shi,
  • Zhi-Feng He,
  • Daniel Cheung,
  • Gen Huang,
  • Xiaobin Zhong,
  • Jin-Chao Dong

摘要

Understanding electrochemical hydrogen evolution reaction (HER) mechanisms requires precise identification of key intermediates (H*, OH*, and H2O*). While in situ single-crystal studies have provided foundational mechanistic insights into interfacial dynamics and intermediate behavior during the HER, extending these findings to structurally complex nano-catalysts remains challenging. Recent advances in in situ characterization techniques have enabled real-time observation of reaction intermediates, yet a systematic understanding across diverse catalyst architectures remains incomplete. This review assesses HER intermediate research, bridging the gap from model single-crystals to nano-catalysts by: (i) discussing methods for intermediate identification and their roles in elucidating HER mechanisms, (ii) summarizing single-crystal surface modification strategies bridging single-crystal model and nano-catalyst studies, and (iii) highlighting current challenges and proposing future directions for catalyst design and intermediate characterization, offering valuable perspectives for developing advanced HER electrocatalysts.