Alkaline Stability of Anion-Exchange Membranes

被引:16
|
作者
Willdorf-Cohen, Sapir [1 ]
Zhegur-Khais, Avital [1 ]
Ponce-Gonzalez, Julia [2 ]
Bsoul-Haj, Saja [1 ]
Varcoe, John R. [3 ]
Diesendruck, Charles E. [4 ,5 ]
Dekel, Dario R. [1 ,5 ]
机构
[1] Technion Israel Inst Technol, Wolfson Dept Chem Engn, IL-3200003 Haifa, Israel
[2] Univ Surrey, Sch Chem & Chem Engn, Guildford GU2 7XH, England
[3] Univ Surrey, Sch Chem & Chem Engn, Guildford GU2 7XH, England
[4] Technion Israel Inst Technol, Schulich Fac Chem & Nancy, IL-3200003 Haifa, Israel
[5] Technion Israel Inst Technol, Nancy & Stephen Grand Technion Energy Program GTEP, IL-3200003 Haifa, Israel
基金
英国工程与自然科学研究理事会;
关键词
anion-exchange membranes; fuel cells; water electrolyzers; functional groups; alkaline stability; chemical degradation; HIGH-PERFORMANCE; FUEL-CELLS; IMIDAZOLIUM CATIONS; CHEMICAL-STABILITY; W CM(-2); WATER; CONDUCTIVITY; DEGRADATION;
D O I
10.1021/acsaem.2c03689
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Recently, the development of durable anion-exchange membrane fuel cells (AEMFCs) has increased in intensity due to their potential to use low-cost, sustainable components. However, the decomposition of the quaternary ammonium (QA) cationic groups in the anion-exchange membranes (AEMs) during cell operation is still a major challenge. Many different QA types and functionalized polymers have been proposed that achieve high AEM stabilities in strongly alkaline aqueous solutions. We previously developed an ex situ technique to measure AEM alkaline stabilities in an environment that simulates the low-hydration conditions in an operating AEMFC. However, this method required the AEMs to be soluble in DMSO solvent, so decomposition could be monitored using 1H nuclear magnetic resonance (NMR). We now report the extension of this ex situ protocol to spectroscopically measure the alkaline stability of insoluble AEMs. The stability ofradiation-grafted (RG) poly(ethylene-co-tetrafluoroethylene)-(ETFE)-based poly(vinylbenzyltrimethylammonium) (ETFE-TMA) and poly(vinylbenzyltriethylammonium) (ETFE-TEA) AEMs were studied using Raman spectroscopy alongside changes in their true OH- conductivities and ion-exchange capacities (IEC). A crosslinked polymer made from poly(styrene-co-vinylbenzyl chloride) random copolymer and N,N,N ',N '-tetraethyl-1,3-propanediamine (TEPDA) was also studied. The results are consistent with our previous studies based on QA-type model small molecules and soluble poly(2,6-dimethylphenylene oxide) (PPO) polymers. Our work presents a reliable ex situ technique to measure the true alkaline stability of AEMs for fuel cells and water electrolyzers.
引用
收藏
页码:1085 / 1092
页数:8
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