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Atomically thin nanosheets can selectively transport thermal protons through nanoscale corrugations and quantum tunneling, making them promising for high-temperature proton-conducting membranes. However, stacked nanosheet assemblies often suffer from poor proton transport between layers. We built nanosheet-based membranes by bridging individual nanosheets using nanoconfined phosphoric acid. This architecture enables low-tortuosity, synergistic proton transport via both through-nanosheet conduction and hydrogen bond\u2013mediated hopping along confined acid layers, resulting in ultrafast, stable proton conduction under anhydrous high-temperature conditions. A polyethylenimine-functionalized graphene\/boron nitride bilayer membrane achieves a proton conductivity of 166 millisiemens per centimeter and delivers a power density of 1011 milliwatts per square centimeter in hydrogen fuel cells at 250\u00b0C, outperforming most previously reported anhydrous proton-conducting membranes. Furthermore, it exhibits superior methanol tolerance, achieving 502\u00a0milliwatts per square centimeter on concentrated methanol. This work offers a versatile platform for next-generation high-temperature proton-conducting membranes.<\/jats:p>","DOI":"10.1126\/sciadv.aea1569","type":"journal-article","created":{"date-parts":[[2026,5,15]],"date-time":"2026-05-15T17:59:07Z","timestamp":1778867947000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":2,"title":["Proton-shuttling nanosheet membranes enable high-power-density protonic fuel cells"],"prefix":"10.1126","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5990-4763","authenticated-orcid":true,"given":"Kaiqiang","family":"He","sequence":"first","affiliation":[{"name":"Department of Chemical and Biological Engineering, Monash University, Clayton, VIC 3800, Australia."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6510-5765","authenticated-orcid":true,"given":"Yuxiang","family":"Wang","sequence":"additional","affiliation":[{"name":"Department 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