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To address these challenges, we develop a solar energy storage and on\u2010demand hydrogen production system by synergistically integrating commercial polyoxometalate (NH\n                    <jats:sub>4<\/jats:sub>\n                    )\n                    <jats:sub>6<\/jats:sub>\n                    H\n                    <jats:sub>2<\/jats:sub>\n                    W\n                    <jats:sub>12<\/jats:sub>\n                    O\n                    <jats:sub>40<\/jats:sub>\n                    (W\n                    <jats:sub>12<\/jats:sub>\n                    ) with graphitic carbon nitride (g\u2010C\n                    <jats:sub>3<\/jats:sub>\n                    N\n                    <jats:sub>4<\/jats:sub>\n                    ). This system demonstrates remarkable efficiency in storing solar energy as electrons within W\n                    <jats:sub>12<\/jats:sub>\n                    during illumination. These stored electrons can be released on demand in the dark through Pt\/C activation to produce H\n                    <jats:sub>2<\/jats:sub>\n                    , achieving a highly efficient hydrogen evolution rate of 3220\u00a0\u00b5mol\u00a0g\n                    <jats:sup>\u22121<\/jats:sup>\n                    \u00a0h\n                    <jats:sup>\u22121<\/jats:sup>\n                    under dark photocatalytic conditions. Notably, the system maintains robust performance under real\u2010world conditions, delivering an outdoor hydrogen evolution rate of 954\u00a0\u00b5mol\u00a0g\n                    <jats:sup>\u22121<\/jats:sup>\n                    \u00a0h\n                    <jats:sup>\u22121<\/jats:sup>\n                    under natural sunlight irradiation. Detailed analysis reveals an optimized electron storage\u2010release pathway, facilitated by the favorable alignment between the reduction potential of W\n                    <jats:sub>12<\/jats:sub>\n                    and the band structure of g\u2010C\n                    <jats:sub>3<\/jats:sub>\n                    N\n                    <jats:sub>4<\/jats:sub>\n                    , as well as the electrostatic self\u2010assembly driven by oppositely charged g\u2010C\n                    <jats:sub>3<\/jats:sub>\n                    N\n                    <jats:sub>4<\/jats:sub>\n                    and W\n                    <jats:sub>12<\/jats:sub>\n                    . In this system, solar energy is facilely stored as stabilized electrons within the POM\u2010semiconductor suspension, which can then be efficiently transported to light\u2010deficient environments and controllably released for on\u2010demand hydrogen evolution.\n                  <\/jats:p>","DOI":"10.1002\/adma.202519875","type":"journal-article","created":{"date-parts":[[2025,12,19]],"date-time":"2025-12-19T09:53:16Z","timestamp":1766137996000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Solar Energy Storage in Polyoxometalate for On\u2010Demand Hydrogen Transportation and Evolution"],"prefix":"10.1002","volume":"38","author":[{"given":"Xiaoyu","family":"Dong","sequence":"first","affiliation":[{"name":"State Key Laboratory of Natural Product Chemistry Key Laboratory of Advanced Catalysis of Gansu Province College of Chemistry and Chemical Engineering Lanzhou University  Lanzhou P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiao","family":"Fang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Natural Product Chemistry Key Laboratory of Advanced Catalysis of Gansu Province College of Chemistry and Chemical Engineering Lanzhou University  Lanzhou P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bonan","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Natural Product Chemistry Key Laboratory of Advanced Catalysis of Gansu Province College of Chemistry and Chemical Engineering Lanzhou University  Lanzhou P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yu","family":"Feng","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Natural Product Chemistry Key Laboratory of Advanced Catalysis of Gansu Province College of Chemistry and Chemical Engineering Lanzhou University  Lanzhou P. R. 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China"},{"name":"Henan Provincial Key Laboratory of Nanocomposites and Applications Institute of Nanostructured Functional Materials Huanghe Science and Technology College  Zhengzhou P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yong","family":"Ding","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Natural Product Chemistry Key Laboratory of Advanced Catalysis of Gansu Province College of Chemistry and Chemical Engineering Lanzhou University  Lanzhou P. R. China"},{"name":"State Key Laboratory of Low Carbon Catalysis and Carbon Dioxide Utilization State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical Physics Chinese Academy of Sciences  Lanzhou P. R. 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