Spontaneous Rise of Hydrogen Microbubbles in Interfacial Gas Evolution Reaction

Kangkana Kalita, Binglin Zeng, Jae Bem You, Yifan Li, Anotidaishe Moyo, Ben Bin Xu, Xuehua Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Liquid organic hydrogen carrier is a promising option for the transport and storage of hydrogen as a clean energy source. This study examines the stability and behavior of organic drops immobilized on a substrate during an interfacial hydrogen-evolution reaction (HER) at the drop surface and its surrounding aqueous solution. Hydrogen microbubbles form within the drop and rise to the drop apex. The growth rate of the hydrogen in-drop bubble increases with the concentration of the reactant in the surrounding medium. The drop remains stable till the buoyancy acting on the in-drop bubble is large enough to overcome the capillary force and the external viscous drag. The bubble spontaneously rises and carries a portion drop liquid to the solution surface. These spontaneous rising in-drop bubbles are detected in measurements using a high-precision sensor placed on the upper surface of the aqueous solution, reversing the settling phase from phase separation in the reactive emulsion. The finding from this work provides new insights into the behaviors of drops and bubbles in many interfacial gas evolution reactions in clean technologies.

Original languageEnglish
JournalSmall
DOIs
Publication statusE-pub ahead of print/First online - 21 Apr 2024

Keywords

  • UT-Hybrid-D
  • Drop self-detachment
  • Gas oversaturation
  • Hydrogen Evolution Reaction (HER)
  • Liquid–liquid interface
  • Capillary force

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