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Area of Science:

  • Electrochemistry
  • Surface Science
  • Chemical Engineering

Background:

  • Optimizing electrochemical water splitting requires understanding gas bubble dynamics at the electrode/electrolyte interface.
  • Controlling hydrogen (H2) evolution is key to improving efficiency.

Purpose of the Study:

  • Investigate gas bubble dynamics during the hydrogen evolution reaction (HER) on a platinum microelectrode.
  • Determine the influence of electrolyte composition on H2 bubble evolution and coalescence.

Main Methods:

  • Electrochemical experiments on a platinum microelectrode.
  • Systematic variation of electrolyte composition.
  • Observation and analysis of H2 gas bubble dynamics.

Main Results:

  • Microbubble coalescence efficiency correlates with the Hofmeister series of anions.
  • Electrolyte composition dictates H2 bubble evolution patterns, from periodic to aperiodic detachment.
  • Solutal Marangoni convection, driven by anion gradients, significantly impacts bubble behavior at practical current densities.

Conclusions:

  • Anion-dependent surface tension gradients induce solutal Marangoni convection, controlling bubble departure diameter.
  • Understanding these dynamics provides new strategies for manipulating gas bubble formation in electrochemical processes.
  • Tailoring electrolyte composition can optimize electrode/electrolyte/gas bubble interface interactions.