Intrinsically Microporous Ion-Pair Coordinated Polyxanthene Membranes Empowering High Temperature Proton Exchange Membrane Fuel Cells: Enhancing Power and Durability through Strengthened Ion-Pair Interactions
발표자
()
초록
내용
PBI-based HT-PEMFCs operating face challenges due to significant PA loss, hindering operation in diverse environmental conditions. To address this, we synthesized polyxanthene-based ion-pair coordinated membranes. The inherent microporosity of biphenol-based PX facilitates PA infiltration, providing an interconnected proton-conducting pathway. Two main chain structures, with and without trifluoromethyl groups, were studied for their effects on porosity and mechanical properties. Investigation of ion-pair interactions involved four distinct side chains. The biphenol-based polymer with quaternary ammonium chains exhibited notable proton conductivity and remarkable PA retention, surpassing other PX derivatives and commercial PBI membranes. The ion-pair coordinated membrane, chosen for its PA conducting attributes, was integrated into the membrane electrode assembly (MEA), resulting in an impressive fuel cell with exceptional durability even after 500 thermal cycles under harsh conditions.