Analysis of Ice Distribution in Cathode Catalyst Layer and Shutdown Mechanism at PEFC Cold Start
Analysis of Ice Distribution in Cathode Catalyst Layer and Shutdown Mechanism at PEFC Cold Start
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PEFC冷启动时阴极催化剂层冰分布及停机机制分析
DOI：
10.1149/05801.0463ecst
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
T. Chikahisa
中科院分区：
文献类型：
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作者：
M. Yamada;K. Suzuki;Y. Tabe;T. Chikahisa
在聚合物电解质燃料电池中，采出水的冻结使电池性能在零度以下恶化。在这项研究中，我们研究了冻结现象在阴极催化剂层（CL）的实验，并确定了电流密度，阴极气体压力，和氧气浓度的影响。结果表明，冰的分布和估计的冰量产生的CL直到关闭取决于电流密度，而它们是独立的阴极气体压力和氧气浓度。为了澄清主导这些趋势的主要原因，我们介绍了冰的形成对增加的通过平面的电阻的CL到三相边界和CL模型的影响，并检查在CL的机制。计算结果与实验电流密度相关性一致，冰的分布与气体压力和氧气浓度无关。
In polymer electrolyte fuel cells, the freezing of produced water deteriorates the cell performance below zero. In this study, we investigated the freezing phenomena in the cathode catalyst layer (CL) by experiments, and identified the effects of current density, cathode gas pressure, and oxygen concentration. It was shown that the ice distribution and the estimated amount of ice produced in the CL till the shutdown depends on the current density, while they are independent of the cathode gas pressure and the oxygen concentration. To clarify the main cause dominating these tendencies, we introduced the effect of ice formation on an increase in the through-plane electrical resistance of the CL into the three phase boundary and the CL models, and examined the mechanism in the CL. The calculation results correspond to the experimental current density dependency, and the ice distribution is independent of the gas pressure and the oxygen concentration.