文献类型：期刊文献

英文题名：Efficient mass transfer optimization via rising bubbles in an electrochemical system with confined plate spacing

作者：Zhang, Wanyi[1];Yuan, Fang[1];Wu, Tao[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：185

外文期刊名：INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

收录：;EI(收录号：20254219330423);WOS:【SCI-EXPANDED(收录号:WOS:001599126000001)】；

基金：This work was financially supported by the National Key Research and Development Program of China (2022YFE0130000-03) , the Na-tional Natural Science Foundation of China (52025103, 22178099, 52200053) , the Shanghai Pujiang Program (2023PJD025) .

语种：英文

外文关键词：Electrochemistry; Confined space; Mass transfer enhancement; Bubble dynamics

摘要：Improving mass transfer is critical for enhancing the efficiency of electrochemical devices, such as liquid flow batteries and water electrolyzers. However, the typical parallel-plate design of these devices, characterized by confined flow channels that aim to increase the reaction area, complicates the enhancement of mass transfer and makes it energy-intensive. This study proposes the use of rising bubbles as an effective strategy for improving mass transfer in a vertical plate electrochemical reactor with a confined 6-mm electrode gap. We measured mass transfer coefficients based on the limiting current and estimated equivalent diffusion layer thicknesses during ferricyanide reduction. Key experiments demonstrate that bubbles introduced at a flow rate of 10 ml/min achieve a mass transfer enhancement comparable to electrode rotation at 529 rad/min. This enhancement even surpasses the improvement observed the improvement observed with forced liquid convection at 1800 ml/min. Furthermore, single-bubble synchronization experiments and numerical simulations reveal quantitative relationships between bubble-induced convection and mass transfer enhancement. These experiments systematically uncover the underlying mechanisms, which are attributed to shear flow at the front of the bubble and the wake at the bubble's tail. This work clearly demonstrates the potential of using bubble-induced convection as a highly efficient strategy for enhancing mass transfer in confined electrochemical systems.