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
{"title":"A surprising relation between operating temperature and stability of anion exchange membrane fuel cells","authors":"Karam Yassin ,&nbsp;Igal G. Rasin ,&nbsp;Sapir Willdorf-Cohen ,&nbsp;Charles E. Diesendruck ,&nbsp;Simon Brandon ,&nbsp;Dario R. Dekel","doi":"10.1016/j.powera.2021.100066","DOIUrl":null,"url":null,"abstract":"<div><p>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.</p></div>","PeriodicalId":34318,"journal":{"name":"Journal of Power Sources Advances","volume":"11 ","pages":"Article 100066"},"PeriodicalIF":5.4000,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.powera.2021.100066","citationCount":"13","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Power Sources Advances","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2666248521000214","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
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.

Abstract Image

查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
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)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 去求助
来源期刊
CiteScore
9.10
自引率
0.00%
发文量
18
审稿时长
64 days
期刊最新文献
Formulating PEO-polycarbonate blends as solid polymer electrolytes by solvent-free extrusion Enhancing performance and sustainability of lithium manganese oxide cathodes with a poly(ionic liquid) binder and ionic liquid electrolyte Enhancing the stability of sodium-ion capacitors by introducing glyoxylic-acetal based electrolyte The implementation of a voltage-based tunneling mechanism in aging models for lithium-ion batteries Electronic structure evolution upon lithiation: A Li K-edge study of silicon oxide anode through X-ray Raman spectroscopy
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1