文献类型：期刊文献

英文题名：Removal of bubbles from eletrodes in a planar cyclonic electrolyzer

作者：Chen, Zhengjun[1];Meng, Chunxiao[1];Ruan, Haoran[1];Li, Renjie[1];Xu, Xiao[1];Liu, Bo[1];Yang, Qiang[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2022

卷号：181

外文期刊名：CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION

收录：;EI(收录号：20223812768619);WOS:【SCI-EXPANDED(收录号:WOS:000865437200007)】；

基金：The authors wish to express their sincere gratitude to the National Natural Science Foundation of China (21908057, 22178099), Shanghai Sailing Program (19YF1411800), and National Key R&D Program of China (2018YFC1801904, 2018YFC1802704), and for financial support. This project was also sponsored by the Special Project for Peak Carbon Dioxide Emissions-Carbon Neutrality (21DZ1207800) from the Shanghai Municipal Science and Technology Commission and "Chenguang Program" supported by Shanghai Education Development Foundation and Shanghai Municipal Education Commission (20CG39).

语种：英文

外文关键词：Planar cyclonic electrolyzer; Bubble detachment; Multiphase flow; Current density; Bubble diameter; Nomenclature

摘要：Alkaline water electrolysis is the most mature and most extensive in-scale hydrogen production technology. For scaled-up electrolyzers, the negative effect of the bubbles formed on the electrodes contributes to high energy consumption and hinders the further expansion of this technology. This study developed a planar cyclonic electrolyzer to improve bubble detachment. The effects of the hydrodynamics on the bubble detachment diameter and current density were studied. According to a proof-of-concept experiment, an increase in the electrolyte velocity led to a gradual decrease in the bubble detachment diameter and a significant increase in the current density. At an applied voltage of 5 V, the detached bubble size decreased from 160 to 82 microns when the electrolyte velocity increased from 0.33 to 2.33 m/s. Meanwhile, a marked rising in the current density from 0.43 to 1.71 A/cm2 was observed. The significance of bubble detachment from an electrode on electrolysis efficiency was discussed. Furthermore, the diaphragm-free separation of hydrogen and oxygen bubbles can be possibly achieved with this novel design.