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Catalyst design is vital for enabling the reactions to occur under ambient conditions. This study reports a new class of van der Waals heterojunction photocatalyst, which is synthesized by hot\u2010injection method, whereby carbon dots (CDs) are grown in situ on ZnSe nanoplatelets (NPLs), i.e., metal chalcogenide quantum wells. The resultant organic\u2010inorganic hybrid nanoparticles, CD\u2010NPLs, are able to perform methanol dehydrogenation through C\uf8ffH splitting. The heterostructure has enabled light\u2010induced charge transfer from the CDs into the NPLs occurring on a sub\u2010nanosecond timescale, with charges remaining separated across the CD\u2010NPLs heterostructure for longer than 500\u00a0ns. This resulted in significantly heightened H\n                    <jats:sub>2<\/jats:sub>\n                    production rate of 107 \u00b5mole\u00b7g\n                    <jats:sup>\u22121<\/jats:sup>\n                    \u00b7h\n                    <jats:sup>\u22121<\/jats:sup>\n                    and enhanced photocurrent density up to 34\u00a0\u00b5A\u00a0cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    at 1\u00a0V bias potential. EPR and NMR analyses confirmed the occurrence of \u03b1\u2010C\uf8ffH splitting and C\uf8ffC coupling. The novel CD\u2010based organic\u2010inorganic semiconductor heterojunction is poised to enable the discovery of a host of new nano\u2010hybrid photocatalysts with full tunability in the band structure, charge transfer, and divergent surface chemistry for guiding photoredox pathways and accelerating reaction rates.\n                  <\/jats:p>","DOI":"10.1002\/smll.202402613","type":"journal-article","created":{"date-parts":[[2024,6,8]],"date-time":"2024-06-08T07:01:10Z","timestamp":1717830070000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Colloidal Synthesis of Carbon Dot\u2010ZnSe Nanoplatelet Van der Waals Heterostructures for Boosting Photocatalytic Generation of Methanol\u2010Storable Hydrogen"],"prefix":"10.1002","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9205-2312","authenticated-orcid":false,"given":"Dechao","family":"Chen","sequence":"first","affiliation":[{"name":"Queensland Micro\u2010 and Nanotechnology Centre Griffith University  Nathan QLD 4111 Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rohan J.","family":"Hudson","sequence":"additional","affiliation":[{"name":"ARC Centre of Excellence in Exciton Science &amp; 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