Abstract
Ionomer is one of the important components in membrane electrode assembly (MEA) of proton exchange membrane fuel cells (PEMFC). It not only acts as an ion exchange membrane for the transfer of protons and water from the anode to the cathode, but more importantly as a binder for gas transport and proton transfer in the catalyst layer. This review focuses on the characteristics and key roles of ionomers in catalyst layers, highlighting the microscopic morphology of ionomers in catalyst inks and catalyst layers. Most importantly, this review plays an important role for the design and functionalization of the lower cost, novel fluorine-free ionomers, which are expected to replace expensive PFSA ionomers.
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