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Surface Microbubbles Attenuate Gas-Evolution Reaction at Soft Interfaces.

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This summary is machine-generated.

Microbubbles on reactive surfaces hinder clean energy tech. This study reveals bubbles reduce reactivity but also drive beneficial flows, offering insights into gas-evolution reactions.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Surface Chemistry

Background:

  • Gas-evolution reactions at solid-liquid interfaces are crucial for clean energy technologies.
  • Microbubble formation on these interfaces can negatively impact performance by blocking active sites and hindering mass transport.
  • The precise mechanism by which microbubbles influence interfacial reactivity is not well understood.

Purpose of the Study:

  • To investigate the interplay between interfacial reactions, microbubble formation, and transport phenomena.
  • To quantify the effect of microbubbles on local interfacial reactivity.
  • To explore the potential for tuning gas-evolution kinetics through controlled bubble dynamics.

Main Methods:

  • Utilized a soft composite film containing a liquid organic hydrogen carrier (LOHC).
  • Employed dual-wavelength reflective interference contrast microscopy (DW-RICM) to observe nanoscale changes and bubble dynamics.
  • Performed spatial mapping to analyze reactivity under and around surface bubbles.

Main Results:

  • Observed H2 generation via base-promoted Si-H bond cleavage in LOHC at the film-liquid interface.
  • Demonstrated that surface bubbles reduce local reactivity by approximately 2-fold due to restricted access of the alkaline phase.
  • Showed that bubble growth induces convective flows, enhancing the transport of reactants and products.

Conclusions:

  • Microbubble coverage has a dual effect: it attenuates reactivity locally but can enhance transport through induced convection.
  • The kinetics of gas-evolution reactions and bubble growth can be modulated by adjusting LOHC loading.
  • The developed platform allows for quantitative investigation of gas-evolution reactions in the presence of bubbles.