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Herein, a polymeric catalyst (NiRF) modified with Ni metal sites on resorcinol\u2010formaldehyde (RF) resin is presented, which can efficiently produce H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    through photocatalysis in pure water. The optimal NiRF\u20105 exhibits an impressive H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    generation rate of up to 31.75\u00a0m\n                    <jats:sc>m<\/jats:sc>\n                    g\n                    <jats:sup>\u22121<\/jats:sup>\n                    \u00a0h\n                    <jats:sup>\u22121<\/jats:sup>\n                    under visible light irradiation, significantly outperforming most catalysts reported to date. Experimental results coupled with theoretical calculations simulation, indicate that the incorporation of nickel ions modulates the band structure of the NiRF resin and provides active sites conducive to the transformation of oxygen. The Ni metal active sites significantly regulate the adsorption capacity of NiRF for O\n                    <jats:sub>2<\/jats:sub>\n                    and ensure a suitable adsorption configuration and energy. This work provides a novel design concept for RF\u2010based photocatalysts and offers an approach for the development of methods for the efficient photocatalytic production of H\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>2<\/jats:sub>\n                    .\n                  <\/jats:p>","DOI":"10.1002\/smll.202500213","type":"journal-article","created":{"date-parts":[[2025,2,19]],"date-time":"2025-02-19T02:31:17Z","timestamp":1739932277000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Oxygen Modulation by Ni Metal Sites in Resorcinol\u2010Formaldehyde Resins for Boosted Photocatalytic H\n                    <sub>2<\/sub>\n                    O\n                    <sub>2<\/sub>\n                    Production From Pure Water"],"prefix":"10.1002","volume":"21","author":[{"given":"Kaiqu","family":"Sun","sequence":"first","affiliation":[{"name":"School of Water Resource and Environment Hebei Province Key Laboratory of Sustained Utilization &amp; Development of Water Recourse Hebei GEO University  Shijiazhuang 050031 P. R. China"},{"name":"School of Material Science and Engineering Jiangsu University of Science and Technology  Zhenjiang Jiangsu 212003 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lan","family":"Guo","sequence":"additional","affiliation":[{"name":"School of Material Science and Engineering Jiangsu University of Science and Technology  Zhenjiang Jiangsu 212003 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jun","family":"Luo","sequence":"additional","affiliation":[{"name":"School of Water Resource and Environment Hebei Province Key Laboratory of Sustained Utilization &amp; Development of Water Recourse Hebei GEO University  Shijiazhuang 050031 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bo","family":"Xiong","sequence":"additional","affiliation":[{"name":"School of Chemistry and Materials Science Hubei Key Laboratory of Quality Control of Characteristic Fruits and Vegetables Hubei Engineering University  Xiaogan 432000 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianhua","family":"Hou","sequence":"additional","affiliation":[{"name":"College of Environmental Science and Engineering Yangzhou University  Yangzhou Jiangsu 225009 P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Changyu","family":"Lu","sequence":"additional","affiliation":[{"name":"School of Water Resource and Environment Hebei Province Key Laboratory of Sustained Utilization &amp; Development of Water Recourse Hebei GEO University  Shijiazhuang 050031 P. R. 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