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Herein, we report a Co(II)-coordination-engineered composite membrane based on Aquivion, in which lattice H2O and NO3\u2013 anions coordinated to Co(II) centers of a superprotonic coordination polymer (PCM-2) dynamically interact with humidified water and sulfonic acid (\u2013SO3H) groups of Aquivion to establish an extended hydrogen-bonding network. This coordination-induced architecture facilitates efficient proton transport while simultaneously reinforcing the polymer matrix, thereby suppressing hydrogen crossover. The optimized membrane (AQV-2, 2 wt % PCM-2 in Aquivion) exhibits a high proton conductivity of 18.6 mS cm\u20131, representing a 61.04% enhancement over the pristine membrane (AQV-0, 11.55 mS cm\u20131), along with significantly reduced gas permeability. Structural integration of the one-dimensional PCM-2 framework further improves microphase-separated water domains and mechanical robustness. When evaluated in a hydrogen-oxygen fuel cell, AQV-2 delivers a superior peak power density of 643.2 mW cm\u20132 and a current density of 880.8 mA cm\u20132 at 0.6 V, outperforming the benchmark Nafion membrane with enhanced operational stability. These results highlight that Co(II)-mediated coordination within short-side-chain ionomers is an effective strategy to concurrently enhance proton transport and gas barrier properties, offering a promising pathway for next-generation high-performance PEMs.<\/jats:p>","DOI":"10.1021\/acsami.6c13091","type":"journal-article","created":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T20:03:39Z","timestamp":1790021019000},"page":"52394-52409","source":"Crossref","is-referenced-by-count":0,"title":["Cobalt (II) Coordination-Tailored Composite Proton Exchange Membrane with Enhanced Proton Conductivity and Suppressed Hydrogen Permeation"],"prefix":"10.1021","volume":"18","author":[{"given":"Suman","family":"Sarkar","sequence":"first","affiliation":[{"name":"CSIR-Central Salt and Marine Chemicals Research Institute , , ,","place":["Bhavnagar, Gujarat, India, 364002"]},{"name":"Academy of Scientific and Innovative Research (AcSIR) , , ,","place":["Ghaziabad, Uttar Pradesh, India, 201002"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6472-0256","authenticated-orcid":true,"given":"Apu","family":"Saha","sequence":"additional","affiliation":[{"name":"Indian Institute of Technology Kharagpur , , , ,","place":["Kharagpur, West Bengal, India, 721302"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sk Miraz","family":"Hossain","sequence":"additional","affiliation":[{"name":"CSIR-Central Salt and Marine Chemicals Research Institute , , ,","place":["Bhavnagar, Gujarat, India, 364002"]},{"name":"Academy of Scientific and Innovative Research (AcSIR) , , ,","place":["Ghaziabad, Uttar Pradesh, India, 201002"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shyam Chand","family":"Pal","sequence":"additional","affiliation":[{"name":"Indian Institute of Technology Kharagpur , , , ,","place":["Kharagpur, West Bengal, India, 721302"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6571-8705","authenticated-orcid":true,"given":"Madhab C.","family":"Das","sequence":"additional","affiliation":[{"name":"Indian Institute of Technology Kharagpur , , , ,","place":["Kharagpur, West Bengal, India, 721302"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2036-770X","authenticated-orcid":true,"given":"Uma","family":"Chatterjee","sequence":"additional","affiliation":[{"name":"CSIR-Central Salt and Marine Chemicals Research Institute , , ,","place":["Bhavnagar, Gujarat, India, 364002"]},{"name":"Academy of Scientific and Innovative Research (AcSIR) , , ,","place":["Ghaziabad, Uttar Pradesh, India, 201002"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,21]]},"reference":[{"key":"2026093001081807000_cit1","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1002\/9781119191766","volume-title":"Fuel Cell Fundamentals","author":"O'Hayre","year":"2016"},{"issue":"7867","key":"2026093001081807000_cit2","doi-asserted-by":"publisher","first-page":"361","DOI":"10.1038\/s41586-021-03482-7","article-title":"Designing the next generation of proton-exchange membrane fuel cells","volume":"595","author":"Jiao","year":"2021","journal-title":"Nature"},{"key":"2026093001081807000_cit3","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202508400","article-title":"Strategies for Lowering Hydrogen Permeation in Membranes for Proton Exchange Membrane Water Electrolyzers and Fuel Cells","volume":"38","author":"Guan","year":"2025","journal-title":"Adv. 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