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Area of Science:

  • Electrochemistry
  • Fluid Dynamics
  • Materials Science

Background:

  • Bubble engineering is crucial for enhancing mass transfer in electrochemical gas-evolution devices.
  • Understanding bubble dynamics, from single-bubble growth to microscale interactions, is key but challenging.
  • Current methods lack the resolution to capture these complex dynamics.

Purpose of the Study:

  • To correlate electrochemical responses with bubble dynamics at high temporal and spatial resolutions.
  • To investigate single-bubble growth, electrode-bubble interactions, and bubble-bubble interactions.
  • To establish a mechanistic framework for bubble engineering strategies.

Main Methods:

  • Integration of ultramicroelectrode electrochemistry with high-speed dark-field microscopy.
  • Synchronized optical and electrochemical signal acquisition.
  • Characterization of oxygen (O2) bubble dynamics during water electrolysis.

Main Results:

  • Characterized position-dependent growth dynamics of O2 bubbles.
  • Quantified superior aerophobicity (contact angle ≈ 170°) of electrogenerated Ni(OH)2 surfaces.
  • Demonstrated electrode-bubble interactions enhancing local mass transfer by ~30% and bubble-bubble interactions enabling rapid current recovery (~4 ms) via coalescence-induced detachment.

Conclusions:

  • Interactions beyond the single-bubble regime, particularly pairwise bubble interactions, are critical.
  • Established a mechanistic framework for a 'counteract-bubbles-with-bubbles' strategy.
  • This strategy is expected to minimize mass transfer resistance in practical gas-evolution devices.