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However, due to the challenges inherent to the synthetic routes, it is almost impossible to grow alkali\u2010metal\u2010doped CN directly on substrates as panels. Here, we introduce a scalable and straightforward vapor\u2010phase condensation and polymerization of CN precursors over KCl\u2010coated substrates, achieving K\n                    <jats:sup>+<\/jats:sup>\n                    doping and forming stable layers with enhanced light absorption, which results in the successful formation of charge carriers below the undoped CN's band edge. The optimal PCPs exhibit improved H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    production, particularly in 100% ethanol, reaching (3.0\u00a0\u00b1\u00a00.4)\u00a0\u00d7\u00a010\n                    <jats:sup>2<\/jats:sup>\n                    \u00a0mM\u00a0m\n                    <jats:sup>\u22122<\/jats:sup>\n                    \u00a0h\n                    <jats:sup>\u22121<\/jats:sup>\n                    , \u223c18 times higher than control undoped CN PCPs (17\u00a0\u00b1\u00a04\u00a0mM\u00a0m\n                    <jats:sup>\u22122<\/jats:sup>\n                    \u00a0h\n                    <jats:sup>\u22121<\/jats:sup>\n                    ) in batch mode. The optimized PCP was evaluated as a large\u2010scale panel (ca. 46\u00a0cm\n                    <jats:sup>2<\/jats:sup>\n                    ) in a continuous\u2010flow configuration for 96\u00a0h, yielding \u223c39\u00a0mM\u00a0m\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>2<\/jats:sup>\n                    \u00a0h\n                    <jats:sup>\u22121<\/jats:sup>\n                    H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    during the first 24\u00a0h and demonstrating this configuration's scalability.\n                  <\/jats:p>","DOI":"10.1002\/smll.202513234","type":"journal-article","created":{"date-parts":[[2026,1,17]],"date-time":"2026-01-17T10:04:42Z","timestamp":1768644282000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Vapor\u2010Phase Synthesis of Potassium\u2010Doped Polymeric Carbon Nitride Photocatalytic Panels"],"prefix":"10.1002","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9310-6052","authenticated-orcid":false,"given":"Devesh","family":"Garg","sequence":"first","affiliation":[{"name":"Department of Chemistry Ben\u2010Gurion University of the Negev  Beer\u2010Sheva Israel"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3268-3868","authenticated-orcid":false,"given":"Gabriel","family":"Mark","sequence":"additional","affiliation":[{"name":"Department of Chemistry Ben\u2010Gurion University of the Negev  Beer\u2010Sheva Israel"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8147-3373","authenticated-orcid":false,"given":"Venugopala Rao","family":"Battula","sequence":"additional","affiliation":[{"name":"Department of Chemistry Ben\u2010Gurion University of the Negev  Beer\u2010Sheva Israel"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-0325-6425","authenticated-orcid":false,"given":"Yotam","family":"Engel","sequence":"additional","affiliation":[{"name":"Department of Materials Engineering Ben\u2010Gurion University of the Negev  Beer\u2010Sheva Israel"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1562-3281","authenticated-orcid":false,"given":"Rohit Kumar","family":"Saini","sequence":"additional","affiliation":[{"name":"Department of Materials Engineering Ben\u2010Gurion University of the Negev  Beer\u2010Sheva Israel"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0574-1911","authenticated-orcid":false,"given":"Alexander I.","family":"Shames","sequence":"additional","affiliation":[{"name":"Department of Physics Ben\u2010Gurion University of the Negev  Beer\u2010Sheva Israel"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-5797-9957","authenticated-orcid":false,"given":"Thamaraichelvan","family":"Marichelvam","sequence":"additional","affiliation":[{"name":"Department of Chemistry Ben\u2010Gurion University of the Negev  Beer\u2010Sheva Israel"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6458-9761","authenticated-orcid":false,"given":"Daniel A.","family":"Grave","sequence":"additional","affiliation":[{"name":"Department of Materials Engineering Ben\u2010Gurion University of the Negev  Beer\u2010Sheva Israel"},{"name":"Ilse Katz Institute for Nanoscale Science and Technology Ben\u2010Gurion University of the Negev  Beer\u2010Sheva Israel"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8510-9336","authenticated-orcid":false,"given":"Michael","family":"Volokh","sequence":"additional","affiliation":[{"name":"Department of Chemistry Ben\u2010Gurion University of the Negev  Beer\u2010Sheva Israel"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4506-4177","authenticated-orcid":false,"given":"Menny","family":"Shalom","sequence":"additional","affiliation":[{"name":"Department of Chemistry Ben\u2010Gurion University of the Negev  Beer\u2010Sheva Israel"},{"name":"Ilse Katz Institute for Nanoscale Science and Technology Ben\u2010Gurion University of the Negev  Beer\u2010Sheva 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