{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,10]],"date-time":"2026-10-10T10:50:05Z","timestamp":1791629405701,"version":"4.3.4"},"reference-count":33,"publisher":"Wiley","issue":"56","license":[{"start":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T00:00:00Z","timestamp":1785369600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T00:00:00Z","timestamp":1785369600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["22178041"],"award-info":[{"award-number":["22178041"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["22021005"],"award-info":[{"award-number":["22021005"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["22141001"],"award-info":[{"award-number":["22141001"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100014103","name":"Key Technology Research and Development Program of Shandong Province","doi-asserted-by":"publisher","award":["2022CXGC010303"],"award-info":[{"award-number":["2022CXGC010303"]}],"id":[{"id":"10.13039\/100014103","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100018617","name":"Liaoning Revitalization Talents Program","doi-asserted-by":"publisher","award":["XLYC2402009"],"award-info":[{"award-number":["XLYC2402009"]}],"id":[{"id":"10.13039\/501100018617","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Small"],"published-print":{"date-parts":[[2026,10]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Current H\n                    <jats:sub>2<\/jats:sub>\n                    \u2010selective polymer membranes face an inescapable permeability\u2010selectivity trade\u2010off. We report a hydrogen\u2010bond crosslinking strategy mediated by pyrophosphoric acid (PPA) to engineer chain packing in unprotonatable 6FDA\u2010TFMB polyimides (PI) for ultra\u2010selective H\n                    <jats:sub>2<\/jats:sub>\n                    separation. Through molecular design, rigid non\u2010coplanar 6FDA\u2010TFMB PI featuring trifluoromethyl side groups was subsequently incorporated with hydroxyl\u2010rich PPA. Collaborative simulation\u2010experimental validation confirmed that the hydrogen\u2010bond (C\u2550O\u00b7\u00b7\u00b7H\u2212O) crosslinking between PI and PPA in the PI\n                    <jats:sub>2<\/jats:sub>\n                    \u2010PPA\n                    <jats:sub>1<\/jats:sub>\n                    \u201060\u00b0C membrane achieved 4% compression of polymer chain spacing (d\u2010spacing from 3.95 to 3.69 \u00c5) compared to pristine PI, constructing a hierarchically graded chain\u2010spacing architecture with 2.18\u20135.17 \u00c5 gradient distribution. This engineering structure endowed the PI\n                    <jats:sub>2<\/jats:sub>\n                    \u2010PPA\n                    <jats:sub>1<\/jats:sub>\n                    \u201060\u00b0C membrane with extremely high H\n                    <jats:sub>2<\/jats:sub>\n                    permeability (167.24 Barrer), while achieving efficient molecular sieving, elevating H\n                    <jats:sub>2<\/jats:sub>\n                    \/CH\n                    <jats:sub>4<\/jats:sub>\n                    and H\n                    <jats:sub>2<\/jats:sub>\n                    \/N\n                    <jats:sub>2<\/jats:sub>\n                    selectivity to 708.51 and 443.56 respectively (PI\u2013H\n                    <jats:sub>2<\/jats:sub>\n                    \/CH\n                    <jats:sub>4<\/jats:sub>\n                    : 95.34; H\n                    <jats:sub>2<\/jats:sub>\n                    \/N\n                    <jats:sub>2<\/jats:sub>\n                    : 40.59). The breakthrough separation performance surpassed the 2015 Robeson upper bound, providing an engineerable supramolecular solution to decouple the permeability\u2010selectivity conflict in membrane technology.\n                  <\/jats:p>","DOI":"10.1002\/smll.75001","type":"journal-article","created":{"date-parts":[[2026,7,30]],"date-time":"2026-07-30T07:43:43Z","timestamp":1785397423000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Pyrophosphoric Acid\u2010Mediated Hydrogen\u2010Bond Crosslinking: Design and Performance Breakthrough in High\u2010Selectivity H\n                    <sub>2<\/sub>\n                    Separation Membranes"],"prefix":"10.1002","volume":"22","author":[{"given":"Fengting","family":"Yao","sequence":"first","affiliation":[{"name":"State Key Laboratory of Fine Chemicals R&amp;D Center of Membrane Science and Technology School of Chemical Engineering Ocean and Life Sciences Dalian 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