Hydrogen Evolution Reaction on Pt Nanoaggregates by Operando Scanning Transmission Electron Microscopy: The Electron Beam, Friend or Foe?

Key Points

• This research aims to understand how the electron beam affects electrocatalytic reactivity during hydrogen evolution reactions on Pt nanoaggregates.
• Utilized operando scanning transmission electron microscopy (STEM) to observe catalysts.
• Evaluated the impact of electron beam on electrocatalytic performance while identifying intermediates.
• Developed a framework to quantify catalytic yields in EC-(S)TEM.
• The electron beam significantly influences apparent electrocatalytic reactivity.
• A framework for cautious interpretation of operando data was established.
• Quantitative analysis suggests that current methodologies may overlook critical interactions.