Physics of Fluids - Publications

Electrolyte design for the manipulation of gas bubble detachment during hydrogen evolution reaction

Open Access
Electrochimica Acta 485, 144084 (2024)

Authors

	Sunghak Park
	Detlef Lohse
	Dominik Krug
	Marc Koper

BibTeΧ

@article{PARK2024144084,
title = {Electrolyte design for the manipulation of gas bubble detachment during hydrogen evolution reaction},
journal = {Electrochimica Acta},
volume = {485},
pages = {144084},
year = {2024},
issn = {0013-4686},
doi = {https://doi.org/10.1016/j.electacta.2024.144084},
url = {https://www.sciencedirect.com/science/article/pii/S0013468624003268},
author = {Sunghak Park and Detlef Lohse and Dominik Krug and Marc T.M. Koper},
keywords = {H gas bubble detachment, Microbubbles coalescence, Thermal Marangoni effect, Solutal Marangoni effect},
abstract = {During electrochemical gas evolution reactions, the continuous and vigorous formation of gas bubbles hugely impacts the efficiency of the underlying electrochemical processes. In particular, enhancing the detachment of gas bubbles from the electrode surface has emerged as an effective strategy to improve reaction efficiency. In this study, we demonstrate that the detachment of H2 gas bubbles can be controlled by the electrolyte composition, which can be optimized. We employ a well-defined Pt microelectrode and utilize electrochemical oscillation analysis to elucidate the features of H2 gas bubble detachment. Our investigation explores how the behaviour of H2 gas bubbles responds to variations in electrolyte composition and concentration. The coalescence efficiency of electrochemically generated microbubbles, a critical factor determining the mode of H2 gas bubble detachment (random detachment vs. single H2 gas bubble detachment), is profoundly influenced by the electrolyte composition. Specifically, coalescence efficiency follows the Hofmeister series concerning anions and coalescence is consistently inhibited in the presence of alkali metal cations. Furthermore, we establish a comprehensive model that accounts for both thermal and solutal Marangoni effects, allowing us to rationalize the trend of detachment size and period of single H2 gas bubbles under various conditions.}
}