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Ionomer membranes which consist of polymer backbones attached with fixed charge groups have been traditionally used in various water treatment processes. Recently, they have also gained increased industrial importance in the applications to electrochemical energy processes such as reverse electrodialysis, fuel cells, redox flow batteries etc. A pore-filled ionomer membrane (PFIM), composed of an inert and tough porous substrate and an ionomer that fills the pores, is considered as a promising candidate for various commercial applications because they can be manufactured via a cheap process and also provide both high ion conductivity and excellent mechanical properties. We will introduce the results on the development of high performance PFIMs for various electrochemical applications.
