{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T16:50:23Z","timestamp":1791910223130,"version":"4.3.4"},"reference-count":62,"publisher":"Wiley","issue":"57","license":[{"start":{"date-parts":[[2026,8,12]],"date-time":"2026-08-12T00:00:00Z","timestamp":1786492800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,8,12]],"date-time":"2026-08-12T00:00:00Z","timestamp":1786492800000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["advanced.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Advanced Materials"],"published-print":{"date-parts":[[2026,10]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Reducing reliance on perfluoroalkyl substances (PFAS) in proton\u2010exchange membrane fuel cells requires hydrocarbon ionomers that combine high performance with long\u2010term durability, a persistent challenge in catalyst\u2010layer design. Here, we identify oxidation\u2010driven ionomer\u2010catalyst interfacial degradation as a dominant failure pathway in hydrocarbon ionomer\u2010bonded cathodes and introduce an adsorption\u2010engineering strategy to overcome this limitation. The comparison of a commercial sulfonated poly(phenylene) (Pemion) with structurally engineered sulfonated poly(fluorene)s demonstrated that electrode durability is governed by the interplay between ionomer adsorption strength and resistance to oxidative degradation on carbon\u2010supported Pt catalysts. A poly(fluorene) ionomer with mobile alkyl sulfonic acid groups forms resilient interfaces, delivering 1.28\u00a0A cm\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>2<\/jats:sup>\n                    at 0.65\u00a0V under fully humidified H\n                    <jats:sub>2<\/jats:sub>\n                    \/air conditions (80\u00b0C and 150\u00a0kPa\n                    <jats:sub>abs<\/jats:sub>\n                    ), comparable to Pemion. After 90,000 accelerated potential cycles, the poly(fluorene)\u2010bonded cathode exhibits significantly improved durability, with only 29% performance loss compared to 58% for Pemion; further molecular refinement reduces the loss to 17%, approaching that of Nafion\u2010bonded cathodes (14%). These findings establish adsorption\u2010engineered ionomer design that decouples interfacial anchoring from oxidative degradation as a general strategy for achieving durable, high\u2010performance PFAS\u2010free PEM fuel cell electrodes.\n                  <\/jats:p>","DOI":"10.1002\/adma.74561","type":"journal-article","created":{"date-parts":[[2026,8,12]],"date-time":"2026-08-12T07:35:53Z","timestamp":1786520153000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Adsorption\u2010Engineered Hydrocarbon Ionomers for Durable Proton\u2010Exchange Membrane Fuel Cells"],"prefix":"10.1002","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-7194-3078","authenticated-orcid":false,"given":"Heemin","family":"Park","sequence":"first","affiliation":[{"name":"MPA\u201011 Los Alamos National Laboratory  Los Alamos New Mexico 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