离聚物
聚合物电解质膜电解
电解
碱性水电解
电解质
化学工程
电解水
肿胀 的
高温电解
膜
高压电解
离子交换
材料科学
化学
无机化学
电极
聚合物
复合材料
离子
有机化学
共聚物
工程类
物理化学
生物化学
作者
Garrett Huang,Mrinmay Mandal,Noor Ul Hassan,Katelyn Groenhout,Alexandra Dobbs,William E. Mustain,Paul A. Kohl
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2021-02-01
卷期号:168 (2): 024503-024503
被引量:32
标识
DOI:10.1149/1945-7111/abde7b
摘要
Green hydrogen produced through anion exchange membrane water electrolysis is a promising, low-cost chemical storage solution for intermittent renewable energy sources. Low-temperature electrolysis using anion exchange membranes (AEM) combines the benefits of established water electrolysis technologies based on alkaline electrolysis and proton exchange membrane electrolysis. The anion conductive ionomers (ACI) used in the AEM electrolyzer (AEMEL) electrodes has been investigated. The ACI serves two primary purposes: (i) facilitate hydroxide conduction between the catalyst and bulk electrolyte and (ii) bind the catalyst to the porous transport layer and membrane. High ion exchange capacity (IEC) ACIs are desired, however, high IEC can cause excessive water uptake (WU) and detrimental ACI swelling. Proper water management is a key factor in obtaining maximum performance in AEM-based devices. In this study, a series of poly(norbornene)-based ACIs were synthesized and deployed in hydrogen evolving AEMEL cathode electrodes. A balance between ionic conductivity, WU and ionomer swelling was achieved in the ACI by varying the IEC and degree of polymer cross-linking. It was found that higher IEC ACIs with light crosslinking are preferred in the HER electrode. Such a configuration fine-tuned the WU and ionomer swelling to achieve optimum cell performance and reduce cell operating voltages.
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