Spontaneous Rise of Hydrogen Microbubbles in Interfacial Gas Evolution Reaction

Author:

Kalita Kangkana1ORCID,Zeng Binglin12,You Jae Bem3,Li Yifan4,Moyo Anotidaishe4,Xu Ben Bin4,Zhang Xuehua15ORCID

Affiliation:

1. Department of Chemical and Materials Engineering University of Alberta Edmonton T6G 1H9 Canada

2. Department of Chemistry The University of Hong Kong Pokfulam Hong Kong 999077 China

3. Department of Chemical Engineering Kyungpook National University 80 Daehak‐ro Buk‐gu Daegu 41566 Republic of Korea

4. Department of Mechanical and Construction Engineering, Faculty of Engineering and Environment Northumbria University Newcastle Upon Tyne NE1 8ST UK

5. Physics of Fluids Group and Max Planck Center for Complex Fluid Dynamics University of Twente 7500 AE Enschede The Netherlands

Abstract

AbstractLiquid 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.

Funder

Mitacs

National Research Foundation of Korea

Canada Research Chairs

Canada Foundation for Innovation

Publisher

Wiley

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