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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Dynamic Interfacial Processes in Single Hydrogen Microbubbles Probed by Operando Opto-Electrochemistry.

Gintu Thomas1, Shubhendra Shukla1, Vignesh Sundaresan1

  • 1Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677, United States.

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|April 12, 2026
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Researchers visualized single hydrogen (H2) microbubble dynamics during electrochemical reactions. They observed bubble growth, movement driven by surface tension gradients, and determined critical nucleation parameters for improved reaction efficiency.

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Area of Science:

  • Electrochemistry
  • Surface Science
  • Fluid Dynamics

Background:

  • Efficient gas-evolving electrochemical reactions are crucial for energy technologies.
  • Understanding single bubble nucleation and growth dynamics at electrode surfaces is key to optimizing these reactions.

Purpose of the Study:

  • To visualize and analyze the growth and dynamics of single hydrogen (H2) microbubbles during the H2 evolution reaction.
  • To determine critical parameters for H2 bubble nucleation and understand the forces governing bubble motion.

Main Methods:

  • Combined pseudo-dark-field optical microscopy with electrochemical measurements.
  • Utilized a 10 μm diameter platinum (Pt) ultra-microelectrode.
  • Analyzed electrochemical current response and optical scattering intensity during bubble formation and evolution.

Main Results:

  • Observed single-bubble nucleation behavior with a rapid current rise and subsequent drop due to electrode blocking.
  • Determined critical nucleus diameter (~0.3 μm), critical dissolved H2 concentration (0.007 M), and internal pressure (~9.6 atm).
  • Documented bubble expansion to ~54 μm, followed by relaxation and abrupt lateral displacement (~10 μm) linked to current shutdown, attributed to Marangoni convection.

Conclusions:

  • Interfacial hydrodynamics, specifically Marangoni convection driven by surface tension gradients, significantly influences bubble behavior at three-phase boundaries.
  • The findings provide critical insights into optimizing gas-evolving electrochemical reactions by controlling bubble dynamics.