电化学腐蚀对气体扩散层氧传质的影响  

Effect of Electrochemical Corrosion on Oxygen Transport Resistance in Gas Diffusion Layer

作　　者：洪亢 朱凯 刘声楚[1,2] 李赏 潘牧[1,2,3] HONG Kang;ZHU Kai;LIU Shengchu;LI Shang;PAN Mu(State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China;Key Laboratory of Hubei Province for Fuel Cells,Wuhan University of Technology,Wuhan 430070,China;Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory,Foshan 528200,Guangdong,China)

机构地区：[1]武汉理工大学材料复合新技术国家重点实验室,武汉430070 [2]武汉理工大学燃料电池湖北省重点实验室,武汉430070 [3]先进能源科学与技术广东省实验室佛山分中心(佛山仙湖实验室),广东佛山528200

出　　处：《材料导报》2022年第20期124-128,共5页Materials Reports

基　　金：国家自然科学基金(22075218);先进能源科学与技术广东省实验室佛山分中心(佛山仙湖实验室)开放基金(XHD2020-002-03)。

摘　　要：通过离线加速实验对气体扩散层进行了不同时间的电化学腐蚀,并且利用极限电流密度来评估电化学腐蚀对气体扩散层氧气传输阻力的影响。结果表明,经过电化学腐蚀后,气体扩散层的干区明显变窄,氧传质阻力显著增大,在相对压力为150 kPa、氧摩尔分数为21%时,经过48 h和72 h电化学腐蚀的气体扩散层的氧传质阻力分别约增大了61.82 s/m、95.62 s/m。采用扫描电镜研究了气体扩散层的形貌变化,通过接触角的变化分析了加速电化学腐蚀后气体扩散层水管理能力下降的原因。The off-line accelerated stress tests were used to conduct the electrochemical corrosion of gas diffusion layer for different hours,and the effect of the electrochemical corrosion time on the oxygen transport resistance of gas diffusion layer was evaluated by limiting current methods.The results show that the dry region of gas diffusion layer is narrower,and the oxygen transport resistance increases significantly after electrochemical corrosion.When the relative pressure is 150 kPa and the oxygen mole fraction is 21%,the oxygen transport resistance values of gas diffusion layer after 48 h and 72 h electrochemical corrosion increase by approximately 61.82 s/m and 95.62 s/m,respectively.The morphology of the gas diffusion layer was studied by scanning electron microscopy(SEM).The reason why the water management ability of gas diffusion layer decreases after electrochemical corrosion was analyzed by SEM image and contact angles.

关 键 词：质子交换膜燃料电池 气体扩散层 电化学腐蚀 氧传质阻力 

分 类 号：TM911.42[电气工程—电力电子与电力传动]