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However, commercial PBI binders suffer from chain aggregation and nonuniform distribution, which block Pt active sites and compromise fuel cell performance. Herein, we demonstrate a facile formic\u2010acid protonation strategy to regulate commercial OPBI binders without disrupting the polymer backbone. Protonation introduces positively charged benzimidazole sites, inducing interchain electrostatic repulsion that loosens chain packing, enlarges intermolecular spacing, and promotes uniform binder dispersion over catalyst surfaces. As a result, protonated OPBI exhibits a 382% increase in phosphoric acid uptake and a proton conductivity of 357 mS cm\n                    <jats:sup>\u22121<\/jats:sup>\n                    . In CL, protonated OPBI reduces proton transport resistance by 63.7%, thereby promoting triple\u2010phase boundary formation, as evidenced by nearly doubled ECSA, while preserving reactant\u2010transport pathways. The resulting membrane electrode assembly delivers a peak power density of 912\u00a0mW cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    and a Pt\u2010mass\u2010specific peak power density of 5.2\u00a0W mg\n                    <jats:sub>Pt<\/jats:sub>\n                    <jats:sup>\u22121<\/jats:sup>\n                    at an ultralow Pt loading of 0.075\u00a0mg cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    . This work highlights protonation\u2010induced chain\u2010packing regulation as an effective strategy for high\u2010performance PBI binders in HT\u2010PEMFCs.\n                  <\/jats:p>","DOI":"10.1002\/advs.78090","type":"journal-article","created":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T04:22:02Z","timestamp":1790655722000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Protonation Modification of Commercial OPBI as Binders Toward High\u2010Performance High\u2010Temperature PEM Fuel Cells"],"prefix":"10.1002","author":[{"given":"Jinzhen","family":"Huang","sequence":"first","affiliation":[{"name":"Guangdong Provincial Key Laboratory of New Energy Materials Service Safety Shenzhen Key Laboratory of Polymer Science and Technology College of Materials Science and Engineering Shenzhen University  Shenzhen People's Republic of China"},{"name":"Zhangjiang Laboratory  Pudong Shanghai People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Minhui","family":"Liang","sequence":"additional","affiliation":[{"name":"Guangdong Provincial Key Laboratory of New Energy Materials Service Safety Shenzhen Key Laboratory of Polymer Science and Technology College of Materials Science and Engineering Shenzhen University  Shenzhen People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jingjing","family":"Lin","sequence":"additional","affiliation":[{"name":"Guangdong Provincial Key Laboratory of New Energy Materials Service Safety Shenzhen Key Laboratory of Polymer Science and Technology College of Materials Science and Engineering Shenzhen University  Shenzhen People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhihuan","family":"Pan","sequence":"additional","affiliation":[{"name":"Guangdong Provincial Key Laboratory of New Energy Materials Service Safety Shenzhen Key Laboratory of Polymer Science and Technology College of Materials Science and Engineering Shenzhen University  Shenzhen People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jinwu","family":"Peng","sequence":"additional","affiliation":[{"name":"Guangdong Provincial Key Laboratory of New Energy Materials Service Safety Shenzhen Key Laboratory of Polymer Science and Technology College of Materials Science and Engineering Shenzhen University  Shenzhen People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2313-2095","authenticated-orcid":false,"given":"Lei","family":"Wang","sequence":"additional","affiliation":[{"name":"Guangdong Provincial Key Laboratory of New Energy Materials Service Safety Shenzhen Key Laboratory of Polymer Science and Technology College of Materials Science and Engineering Shenzhen University  Shenzhen People's Republic of China"},{"name":"Zhangjiang Laboratory  Pudong Shanghai People's Republic of China"},{"name":"Key laboratory of Resources Environmental and Green Low Carbon Processes in East Guangdong School of Materials Science and Engineering Hanshan Normal University  Chaozhou People's Republic of 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