Ion-Pair Interactions in Polyphenylene-Based Quaternized Membranes Designed for Phosphoric Acid-Doped Proton Exchange Membranes for High-Temperature Fuel Cells.

ABSTRACT: Phosphoric acid (PA)-doped proton exchange membranes (PEMs) face significant challenges owing to the loss of PA, particularly under high humidity conditions. Ion-pair interactions between PA and quaternary ammonium (QA) groups can effectively mitigate PA loss. Herein, polyphenylene-based quaternized membranes (BAF-QAF and C7-QAF) comprising distinct hydrophobic moieties [BAF = (perfluoropropane-2,2-diyl)dibenzene and C7 = 1,1-diphenylcycloheptane] and fluorenyl groups with pendant QA head groups are designed and used as PA-doped PEMs with low or no fluorine contents to realize high-temperature and low-humidity operability. The resulting membranes exhibited excellent PA retention, maintaining >85% of their initial proton conductivities at 90% relative humidity after 10 humidity cycles. PA-d

SUBMITTER: Guo L 

PROVIDER: S-EPMC12499463 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature