Vicious cycle during chemical degradation of sulfonated aromatic proton exchange membranes in the fuel cell application,International Journal of Energy Research

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Vicious cycle during chemical degradation of sulfonated aromatic proton exchange membranes in the fuel cell application
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2020-06-23 , DOI: 10.1002/er.5596
Aida Karimi ₁ , Seyed Hesam Mirfarsi _{1,

2} , Soosan Rowshanzamir _{1,

2,

3} , Fatemeh Beyraghi ₁ , Daniel Lester ₄

Affiliation

Weak phase separation and vulnerable linking groups between aromatic units are common setbacks of sulfonated aromatic proton exchange membranes (PEMs) from durability point of view. In this study, sulfonated poly(ether ether ketone) (SPEEK) membranes were exposed to Fenton's solution for a specific time, ranging from 10 to 60 minutes. Chemical structure and morphology evolution, decay in mechanical and thermal stability, and H₂ permeability of SPEEK membranes were evaluated during the chemical degradation. Less‐entangled polymeric chains with lower average molecular weight of degraded SPEEK samples diminished mechanical rigidity. In addition, reduction of aromatic rings in each repeat unit led to higher thermal decomposition rate. Furthermore, randomly distributed micro‐defects in the SPEEK morphology and an increase in water sorption can reduce the fatigue strength of membranes in the wet‐dry cycles. Eventually, hydrogen cross‐over rate was gradually increased, and henceforth, accelerated destructive radical formation and degradation can be predicted.

中文翻译：

磺化芳族质子交换膜在燃料电池中的化学降解过程中的恶性循环

从耐久性的观点来看，芳族单元之间的弱相分离和脆弱的连接基团是磺化芳族质子交换膜（PEM）的常见缺点。在这项研究中，将磺化聚醚醚酮（SPEEK）膜暴露于Fenton溶液中特定的时间，范围为10至60分钟。化学结构和形态演变，机械和热稳定性下降以及H ₂在化学降解过程中评估了SPEEK膜的渗透性。降解程度较低的SPEEK样品的平均分子量较低的缠结较少的聚合物链会降低机械刚度。另外，每个重复单元中芳环的还原导致更高的热分解速率。此外，SPEEK形态中随机分布的微缺陷和吸水率的增加可以降低干湿循环中膜的疲劳强度。最终，氢的穿越速率逐渐增加，因此，可以预测加速破坏性自由基的形成和降解。

更新日期：2020-06-23

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