A surprising relation between operating temperature and stability of anion exchange membrane fuel cells

IF 5.4 Q2 CHEMISTRY, PHYSICAL Journal of Power Sources Advances Pub Date : 2021-10-01 DOI:10.1016/j.powera.2021.100066
Karam Yassin , Igal G. Rasin , Sapir Willdorf-Cohen , Charles E. Diesendruck , Simon Brandon , Dario R. Dekel
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引用次数: 13

Abstract

Anion-exchange membrane fuel cells (AEMFCs) show substantially enhanced (initial) performance and efficiency with the increase of operational temperature (where typical values are below 80 °C). This is directly due to the increase in reaction and mass transfer rates with temperature. Common sense suggests however that the increase of ionomeric material chemical degradation kinetics with temperature is likely to offset the above mentioned gain in performance and efficiency. In this computational study we investigate the combined effect of a high operating temperature, up to 120 °C, on the performance and stability of AEMFCs. Our modeling results demonstrate the expected positive impact of operating temperature on AEMFC performance. More interestingly, under certain conditions, AEMFC performance stability is surprisingly enhanced as temperature increases. While increasing cell temperature enhances degradation kinetics, it simultaneously improves water diffusivity through the membrane, resulting in higher hydration levels at the cathode. This, in turn, encourages a decrease in ionomer chemical degradation which depends on the hydration as well as on temperature, leading to a significant increase in AEMFC performance stability and, therefore, in its lifetime. These findings predict the possible advantage (and importance), in terms of performance and durability, of developing high-temperature AEMFCs for automotive and other applications.

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阴离子交换膜燃料电池工作温度与稳定性的惊人关系
阴离子交换膜燃料电池(aemfc)的性能和效率随着工作温度(典型值低于80°C)的增加而显著增强。这是由于反应速率和传质速率随温度的增加而直接引起的。然而,常识表明,离子材料化学降解动力学随温度的增加可能抵消上述性能和效率的增益。在本计算研究中,我们研究了高达120°C的高工作温度对aemfc性能和稳定性的综合影响。我们的建模结果显示了预期的工作温度对AEMFC性能的积极影响。更有趣的是,在一定条件下,AEMFC的性能稳定性随着温度的升高而惊人地增强。在提高电池温度增强降解动力学的同时,它同时提高了水通过膜的扩散率,从而提高了阴极的水化水平。这反过来又促进了离子单体化学降解的减少,这取决于水合作用和温度,从而显著提高了AEMFC的性能稳定性,从而延长了其使用寿命。这些发现预测了开发用于汽车和其他应用的高温aemfc在性能和耐用性方面可能具有的优势(和重要性)。
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来源期刊
CiteScore
9.10
自引率
0.00%
发文量
18
审稿时长
64 days
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