【摘要】 以PBI/H3PO4体系高温质子交换膜燃料电池为研究对象,进行了500h恒负载条件下的连续寿命实验,运用电化学电位扫描技术和交流阻抗技术测试了电池在连续运行过程中的电化学活性面积(AEC)和电池内阻的变化,实验结果表明在500h的连续寿命实验中,电池性能衰减的主要原因是高温操作条件下由于催化剂的烧结造成的电化学活性面积的损失。同时,建立了基于高温体系的一维数学模型,利用电化学方法测试得到的两个重要参数——体交换电流密度和电池内阻作为模型输入参数,计算了电极扩散层的反应气体浓度分布,运用模型模拟了电池在连续寿命实验中不同时间的稳态极化曲线,模拟结果和实验结果基本一致。更多还原

【Abstract】 500 h continuous life test was performed on PBI /H3PO4 high temperature PEMFC, and electrochemical methods were applied to measure the changes of electrochemical surface area (AEC) and internal resistance with time. The initial experimental results show that the main reason for performance degradation is the decrease of ESA that caused by sintering during high temperature operation. In addition, one dimension steady state numerical modeling was constructed to simulate the degradation behavior based on the measured parameters by electrochemical techniques; simulated and experimental results are almost the same.更多还原