Anion Exchange Ionomers: Design Considerations and Recent Advances - An Electrochemical Perspective

被引:36
作者
Favero, Silvia [1 ]
Stephens, Ifan E. L. [2 ]
Titirci, Maria-Magdalena [1 ]
机构
[1] Imperial Coll London, Dept Chem Engn, London SW7 2BU, England
[2] Imperial Coll London, Dept Mat, London SW7 2BU, England
基金
英国工程与自然科学研究理事会;
关键词
AEM electrolyzers; AEM fuel cells; anion exchange ionomer; ALKALINE POLYMER ELECTROLYTE; MEMBRANE FUEL-CELLS; IMIDAZOLIUM CATIONS; OXYGEN REDUCTION; IONOMER/CARBON RATIO; TRANSITION-METAL; CATALYTIC LAYER; CARBON-DIOXIDE; WATER; PERFORMANCE;
D O I
10.1002/adma.202308238
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Alkaline-based electrochemical devices, such as anion exchange membrane (AEM) fuel cells and electrolyzers, are receiving increasing attention. However, while the catalysts and membrane are methodically studied, the ionomer is largely overlooked. In fact, most of the studies in alkaline electrolytes are conducted using the commercial proton exchange ionomer Nafion. The ionomer provides ionic conductivity; it is also essential for gas transport and water management, as well as for controlling the mechanical stability and the morphology of the catalyst layer. Moreover, the ionomer has distinct requirements that differ from those of anion-exchange membranes, such as a high gas permeability, and that depend on the specific electrode, such as water management. As a result, it is necessary to tailor the ionomer structure to the specific application in isolation and as part of the catalyst layer. In this review, an overview of the current state of the art for anion exchange ionomers is provided, summarizing their specific requirements and limitations in the context of AEM electrolyzers and fuel cells. Alkaline-based electrochemical devices receive increasing attention as emerging technologies for the decarbonization of the energy sector. An essential component of these devices is the anion exchange ionomer, which is responsible for the mechanical integrity, morphology, activity, and even stability of the catalyst layer. In this review, an overview of the state-of-the-art, requirements, and remaining challenges of this ionomer are provided.image
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页数:26
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