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To address these issues, here we present gel-state polybenzimidazole membranes with double cross-linked three-dimensional layered structures via a polyphosphoric acid sol-gel process, enabling stable operation above 200\u2009\u00b0C. These membranes, featuring proton-conducting cross-linking phosphate bridges and branched polybenzimidazole networks, effectively anchor and retain phosphoric acid molecules, prevent 96% of its dehydration and condensation, improve creep resistance, and maintain excellent proton conductivity stability. The resulting membrane, with superior through-plane proton conductivity of 0.348\u2009S\u2009cm\n                    <jats:sup>\u22121<\/jats:sup>\n                    , delivers outstanding peak power densities ranging from 1.20\u20131.48\u2009W\u2009cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    in fuel cells operated at 200-240\u2009\u00b0C and a low voltage decay rate of only 0.27\u2009mV\u2009h\n                    <jats:sup>\u22121<\/jats:sup>\n                    over a 250-hour period at 220\u2009\u00b0C, opening up possibilities for their direct integration with methanol steam reforming systems.\n                  <\/jats:p>","DOI":"10.1038\/s41467-024-47627-4","type":"journal-article","created":{"date-parts":[[2024,4,22]],"date-time":"2024-04-22T14:02:16Z","timestamp":1713794536000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":97,"title":["Double cross-linked 3D layered PBI proton exchange membranes for stable fuel cell performance above 200\u2009\u00b0C"],"prefix":"10.1038","volume":"15","author":[{"given":"Liang","family":"Zhang","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mengjiao","family":"Liu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Danyi","family":"Zhu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mingyuan","family":"Tang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Taizhong","family":"Zhu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Congjie","family":"Gao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9313-9639","authenticated-orcid":false,"given":"Fei","family":"Huang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1110-3684","authenticated-orcid":false,"given":"Lixin","family":"Xue","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,4,22]]},"reference":[{"key":"47627_CR1","doi-asserted-by":"publisher","first-page":"4371","DOI":"10.1016\/j.ijhydene.2022.10.156","volume":"48","author":"MA Aminudin","year":"2023","unstructured":"Aminudin, M. 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