电源技术2024，Vol.48Issue(6)：1018-1024,7.DOI:10.3969/j.issn.1002-087X.2024.06.007
PEMFC启停工况下的阳极氢空混合区域分析
Analysis of hydrogen-air mixing region in PEMFC anode under start-stop condition
摘要
Abstract
Under the start-stop conditions of proton exchange membrane fuel cells,it is generally ac-knowledged that the hydrogen-air front forms in the anode flow channel,resulting in high cathode potential,which leads to the electrochemical corrosion of cathode materials.In fact,when hydrogen contacts with air,the convection and diffusion occur,and a hydrogen-air mixing region forms in the anode channel.The range,time and electrolyte potential of the hydrogen-air mixing region were cal-culated by deriving the kinematics model of the hydrogen-air mixing region and the mathematical model of the electrolyte potential distribution.The results show that the duration time of the cathode high potential caused by the hydrogen-air mixing region is longer than the existence time of the hydrogen-air front,and the corresponding electrolyte potential is-0.304--0.260 V.The distribution range and duration time of the hydrogen-air mixing region are affected by the inlet gas flow rate and the equivalent diameter of the flow channel.For each 0.1 mm increase of the equivalent diameter,the maximum value of the mixing area increases by 4 mm,and the duration time of the overall cathode high potential extends by 1.25%.The above results provide the theoretical basis for the design of the anode flow channel and the control strategy under start-stop conditions.关键词
质子交换膜燃料电池/氢空混合区域/启停工况/电解质电势Key words
PEMFC/hydrogen-air mixing region/start-stop condition/electrolyte potential分类
信息技术与安全科学引用本文复制引用
时贞勃,涂重阳,谭金婷,潘牧..PEMFC启停工况下的阳极氢空混合区域分析[J].电源技术,2024,48(6):1018-1024,7.基金项目
国家自然科学基金(22109122,22209026) （22109122,22209026）
