Single Particle Hopping as an Indicator for Evaluating Electrocatalysts

Jun Gang Wang, Linjuan Zhang, Jing Xie, Yossi Weizmann, Di Li, Jinghong Li

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


The design and screening of electrocatalysts for gas evolution reactions suffer from little understanding of multiphase processes at the electrode-electrolyte interface. Due to the complexity of the multiphase interface, it is still a great challenge to capture gas evolution dynamics under operando conditions to precisely portray the intrinsic catalytic performance of the interface. Here, we establish a single particle imaging method to real-time monitor a potential-dependent vertical motion or hopping of electrocatalysts induced by electrogenerated gas nanobubbles. The hopping feature of a single particle is closely correlated with intrinsic activities of electrocatalysts and thus is developed as an indicator to evaluate gas evolution performance of various electrocatalysts. This optical indicator diminishes interference from heterogeneous morphologies, non-Faradaic processes, and parasitic side reactions that are unavoidable in conventional electrochemical measurements, therefore enabling precise evaluation and high-throughput screening of catalysts for gas evolution systems.

Original languageEnglish
Pages (from-to)5495-5502
Number of pages8
JournalNano Letters
Issue number13
StatePublished - 13 Jul 2022


  • electrochemical imaging
  • electrochemical total internal reflection microscopy
  • electrode-electrolyte interface
  • gas evolution
  • indicator

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Bioengineering
  • Chemistry (all)
  • Materials Science (all)


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