文献类型：期刊文献

英文题名：Electrolyte-regulated bubble coalescence governs detachment size and electrolysis efficiency in hydrogen evolution

作者：Wu, Tao[1];Zhu, ZiJian[1];Liu, Yuxi[1];Zhang, WanYi[1];Yuan, Fang[1];Liu, Bo[1];Yang, Qiang[1]

机构：[1]East China Univ Sci & Technol, Dept Mech & Power Engn, Shanghai, Peoples R China

年份：2025

卷号：175

外文期刊名：INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

收录：;EI(收录号：20253719148249);WOS:【SCI-EXPANDED(收录号:WOS:001573913000001)】；

基金：This work was financially supported by the National Natural Science Foundation of China (Grant.Nos.52025103,22178099) , the Shanghai Natural Science Foundation (Gra-nt.No.21ZR1417000) , the Shanghai Pilot Program for Basic Research (Grant. No. 22TQ1400100-11) .

语种：英文

外文关键词：Water electrolysis; Gas bubble dynamics; Electrolyte composition; Bubble coalescence; Electrolysis efficiency

摘要：The adhesion and growth of gas bubbles during water electrolysis increase overpotential and energy loss, and their behavior is strongly influenced by electrolyte composition. In this study, a 500 mu m-diameter platinum microelectrode was used to investigate bubble detachment behavior and electrolysis current in six electrolyte systems under constant potential conditions. The results reveal that, even at identical applied potentials and proton concentrations, both bubble detachment size and electrolysis current vary significantly with electrolyte type. In coalescence-prone electrolytes (e.g., H2SO4 and HNO3), large single bubbles form and detach at high potentials (up to similar to 1000 mu m at -5.34 V), supporting higher electrolysis currents. In contrast, coalescence-inhibiting electrolytes (e.g., HClO4 and Na2SO4) produced smaller, multiple bubbles (as low as 187 mu m) and exhibited substantially lower currents-up to 52 % lower at more negative potential. These findings highlight electrolyte-regulated bubble coalescence as a critical and often overlooked factor in gas-evolving electrochemical systems. Designing electrolytes or electrode structures that promote moderate bubble coalescence offers a promising strategy for improving energy efficiency in high-rate water electrolysis and related industrial applications.