文献类型：期刊文献

英文题名：Effects of trans-diaphragm liquid flow on hydrogen-in-oxygen in alkaline water electrolysis

作者：Wu, Tao[1];Zhou, Yujie[1];Yuan, Fang[1];Yang, Qiang[1];Liu, Bo[1]

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

年份：2025

卷号：105

起止页码：1393

外文期刊名：INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

收录：;EI(收录号：20250617805787);WOS:【SCI-EXPANDED(收录号:WOS:001417147400001)】；

基金：This work was financially supported by the National Natural Science Foundation of China (Nos. 22178099, 52025103), the Shanghai Natural Science Foundation (21ZR1417000), the Shanghai Special Basic Research Zone (22TQ1400100-11), Carbon Neutral Special Project of Shanghai Municipal Science and Technology Commission-Research and Development of Key Technology and Equipment for High Efficiency and High Power Alkaline Water Hydrogen Generation (21DZ1207800), the Research and Development of Key Technologies and Equipment for Carbon Capture and Mass Transfer Enhancement in Flue Gas of One Million Tons/Year (2022YFE0130000), and the Hydrogen Energy Green Manufacturing and Utilisation Key Core Technology Integration and Research Platform.

语种：英文

外文关键词：Gas purity; HTO; Alkaline water electrolysis; Trans-diaphragm; Convection

摘要：Reducing hydrogen-in-oxygen (HTO) to mitigate the explosive hazard is critical for the renewable energy powered alkaline water electrolysis (AWE). However, the role of trans-diaphragm convection in influencing HTO remains poorly characterized. In this study, we employ a home-designed AWE experimental system with separated liquid circulation circuits for the hydrogen side and oxygen side, respectively, which facilitates the precise measurement of trans-diaphragm flow rates and their effects on HTO. Experimental results reveal a persistent liquid convection carrying dissolved hydrogen from the hydrogen compartment to the oxygen compartment. This convection flowrate increases with both the electrolysis current and the electrolyte circulation rate, constituting 10-15% of the circulation flow rate on the hydrogen side. Through theoretical modeling, we established a linear correlation between the dissolved hydrogen crossover rate (QH2 ) and the liquid crossover rate (Qlc), demonstrating that the dissolved hydrogen in the liquid exceeds saturation levels by approximately 0.36 times. Importantly, reducing liquid crossover by modulating electrolyte circulation resulted a remarkable reduction in HTO from 0.6% to below 0.1% at the same electrolysis current-an approximately 80% decrease. These findings offer critical insights into the origin of HTO and provide actionable strategies for optimizing AWE operation, paving the way for safer and more efficient large-scale green hydrogen production.