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To date, their scalable manufacturing is confined by complex post\u2010processing or high\u2010temperature calcination (\u2265 800\u00b0C), which are often required for conventional small\u2010sized nanoparticles. Herein, we have successfully developed a thermal buffer\u2010assisted low\u2010temperature (250\u00b0C) calcination strategy to create a sub\u2010nano Ru metallene called \u201cRu clusterrene\u201d for anion exchange membrane water electrolysis (AEMWE). The rational use of NaCl is pivotal for successful synthesis, serving as a \u201cbuffer\u201d to prevent thermal runaway. Consequently, the Ru clusterrene exhibits an ultra\u2010thin, fluid\u2010like structure that enables strong interaction with the substrate and ensures maximized active site exposure. Importantly, this strategy costs only US$39.42\/g\n                    <jats:sub>Ru<\/jats:sub>\n                    , which is substantially lower than that of commercial Ru\/C (Premetek, US$1407.50\/g\n                    <jats:sub>Ru<\/jats:sub>\n                    ). The Ru clusterrene delivers an outstanding activity of 1.73 V@2 A cm\n                    <jats:sup>\u20122<\/jats:sup>\n                    and 2.0 V@5.4 A cm\n                    <jats:sup>\u20122<\/jats:sup>\n                    , as well as an unprecedented stability for 1000\u00a0h at 2 A cm\n                    <jats:sup>\u20122<\/jats:sup>\n                    (80\u00b0C) and 3500\u00a0h at 1 A cm\n                    <jats:sup>\u20122<\/jats:sup>\n                    (50\u00b0C). More significantly, it exhibits a high stack performance in AEMWE (3.6 V@1 A cm\n                    <jats:sup>\u20122<\/jats:sup>\n                    and 2000 h@25 A), representing the most advanced level for AEMWE cathode\u00a0catalyst.\n                  <\/jats:p>","DOI":"10.1002\/anie.5543861","type":"journal-article","created":{"date-parts":[[2026,4,16]],"date-time":"2026-04-16T08:05:43Z","timestamp":1776326743000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["A Low\u2010Temperature Solid Chemistry to Ru Clusterrene for Scalable Hydrogen Production"],"prefix":"10.1002","volume":"65","author":[{"given":"Rui","family":"Qin","sequence":"first","affiliation":[{"name":"State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical Engineering Xiamen University  Xiamen China"},{"name":"College of Materials Science and Engineering Huaqiao University  Xiamen 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