Comparison of degradation behaviors for open-ended and closed proton exchange membrane fuel cells du
Comparison of degradation behaviors for open-ended and closed proton exchange membrane fuel cells du
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DOI：
10.1016/j.jpowsour.2011.01.075
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发表时间：
2011-06
期刊：
影响因子：
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通讯作者：
Yi Yu;Z. Tu;Haining Zhang;Z. Zhan;M. Pan
中科院分区：
文献类型：
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作者：
Yi Yu;Z. Tu;Haining Zhang;Z. Zhan;M. Pan
作为催化剂载体材料，碳材料的氧化被认为是质子交换膜燃料电池在启动和关闭过程中性能衰减的主要因素之一，必须减轻该氧化以实现可接受的耐久性。本文采用开口式和封闭式两种单电池，研究了阴极排气条件对燃料电池降解行为的影响。引入虚拟负载时的阴极入口压力是分析不同条件下膜电极组件性能衰减的重要因素。电化学技术，包括测量的极化曲线，循环和线性扫描伏安法，和横截面扫描电子显微镜的测试膜电极组件，被用来评估燃料电池的性能衰减。结果表明，在引入假负载期间关闭的阴极排气阀将显著减轻性能衰减和电化学活性表面积的减小，从而改善燃料电池的耐久性。在频繁的启动和关闭过程中，对于开放式和封闭式电池都没有观察到膜的显著劣化。
As catalyst support materials, the oxidation of carbon materials is considered one of the major factors for performance decay during the startup and shutdown process of proton exchange membrane fuel cells, which must be mitigated to achieve acceptable durability. In this paper, the effect of cathode exhaust conditions on the degradation behaviors of fuel cells is investigated using two single cells named the open-ended and closed cells. The cathode inlet pressure during the introduction of the dummy load is an important factor in analyzing the performance decay of membrane electrode assemblies under different conditions. Electrochemical techniques, including the measurement of polarization curves, cyclic and linear sweep voltammetry, and cross-sectional scanning electron microscopy of tested membrane electrode assemblies, are employed to evaluate the performance decay of fuel cells. The results show that a closed cathode exhaust valve during the introduction of the dummy load would significantly alleviate both the performance decay and the decrease in the electrochemically active surface area, resulting in an improvement in fuel cell durability. No significant deterioration of the membranes is observed for both the open-ended and the closed cells during frequent startup and shutdown processes.