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Its production through solar energy and metal\u2010free photocatalysts is desirable. Organic semiconductors, as a new generation of semiconductors, can form suitable transition state intermediates showing great ability in enhancing the efficiency and selectivity of photocatalytic H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    generation, offering a metal\u2010free, green, and more economical solution. However, the smaller Frenkel exciton radius and larger exciton Coulomb binding energy lead to a constrained capacity for exciton dissociation, blocking the way of photocatalysts based on organic semiconductors. Here, we overcome the bottleneck by cocrystal engineering. A kind of cocrystal photocatalysts with X\u2010packing are designed and synthesized, which permit all excited states to be optically allowed due to reduced energy splitting, enhancing the exciton participation in photosynthesis of H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    giving much more efficient singlet exciton dissociation and exciton utilization. Indeed, the X\u2010packed cocrystals show photosynthesis of H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    from O\n                    <jats:sub>2<\/jats:sub>\n                    and H\n                    <jats:sub>2<\/jats:sub>\n                    O at a rate of 2.65\u00a0mmol h\n                    <jats:sup>\u22121<\/jats:sup>\n                    g\n                    <jats:sup>\u22121<\/jats:sup>\n                    and a solar\u2010chemical energy conversion efficiency of 0.42%, which can be further improved to 13.3\u00a0mmol h\n                    <jats:sup>\u22121<\/jats:sup>\n                    g\n                    <jats:sup>\u22121<\/jats:sup>\n                    with a hole sacrificial agent. This work seems to open a new door for high solar exciton utilization with organic semiconductors by cocrystal engineering.\n                  <\/jats:p>","DOI":"10.1002\/adma.73295","type":"journal-article","created":{"date-parts":[[2026,5,6]],"date-time":"2026-05-06T09:01:11Z","timestamp":1778058071000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Enhanced Hydrogen Peroxide Photosynthesis Using X\u2010Packed Cocrystal Catalysts"],"prefix":"10.1002","volume":"38","author":[{"given":"Lingsong","family":"Wang","sequence":"first","affiliation":[{"name":"State Key Laboratory of Advanced Materials for Intelligent Sensing Key Laboratory of Organic Integrated Circuits Ministry of Education Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of Chemistry School of Science Tianjin University  Tianjin 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