{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,18]],"date-time":"2026-10-18T21:39:52Z","timestamp":1792359592491,"version":"4.4.0"},"reference-count":37,"publisher":"Wiley","license":[{"start":{"date-parts":[[2026,10,18]],"date-time":"2026-10-18T00:00:00Z","timestamp":1792281600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,10,18]],"date-time":"2026-10-18T00:00:00Z","timestamp":1792281600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/501100012226","name":"Fundamental Research Funds for the Central Universities","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100012226","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Small"],"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Constructing hetero\u2010structured membranes with well\u2010defined pore architectures is a promising strategy to enhance gas separation performance, yet achieving structural continuity across different layers remains challenging. Here, we report a hetero\u2010structured covalent organic framework (COF) membrane featuring graded pores that transition from a microporous selective layer to a mesoporous support. Unlike conventional layer\u2010by\u2010layer assembly, our approach employs a pre\u2010adsorption\u2010induced heteroepitaxial growth strategy, wherein hydrazine monomers are electrostatically pre\u2010organized within the channels of a sulfonated COF scaffold (TpBD\u2010SO\n                    <jats:sub>3<\/jats:sub>\n                    H). This spatial confinement directs the nucleation and growth of the secondary COF layer (TpHz), creating a chemically integrated and robust interface with a continuous pore size transition from 0.9 nm to 2.5 nm, as evidenced by an intermediate pore size of 1.9 nm arising from partial channel penetration. The resulting membrane exhibits an H\n                    <jats:sub>2<\/jats:sub>\n                    permeance of 1854 GPU and an H\n                    <jats:sub>2<\/jats:sub>\n                    \/CO\n                    <jats:sub>2<\/jats:sub>\n                    selectivity of 15, surpassing the 2008 Robeson upper bound. This work demonstrates that graded pore engineering offers an effective route to combine high permeability with molecular sieving precision in crystalline membrane design.\n                  <\/jats:p>","DOI":"10.1002\/smll.76348","type":"journal-article","created":{"date-parts":[[2026,10,18]],"date-time":"2026-10-18T20:51:11Z","timestamp":1792356671000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Hetero\u2010Structured COF Membranes with Graded Pores for Efficient H\n                    <sub>2<\/sub>\n                    Purification"],"prefix":"10.1002","author":[{"given":"Xiaohe","family":"Tian","sequence":"first","affiliation":[{"name":"State Key Laboratory of Chemo and Biosensing College of Chemistry and Chemical Engineering Hunan University  Changsha 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