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Due to the metastable nature of H2O2, an ideal photocatalyst should possess excellent optoelectronic properties for fast H2O2 generation and a suitable surface to prevent H2O2 decomposition by photogenerated charge carriers. In this work, we have developed an efficient photocatalyst based on nitrogen-rich carbon nitride (C3N5). Potassium ion (K+) was applied to modify the electronic structure and surface properties of C3N5 to improve its H2O2 accumulation concentration. It shows that K+ can lower exciton binding energy and extend the lifetime of photogenerated charge carriers. A more stable *OOH intermediate is formed on KC3N5, with the O2 adsorption configuration changed from the Yeager type to the Pauling type on KC3N5. As a result, KC3N5 shows a selectivity of 97.2% for H2O2 generation pathway, achieving a H2O2 production rate of 44.2 mmol h\u20131 g\u20131 with an apparent quantum yield (AQY) of 89.3% at 420 nm. More impressively, after 16 h of continuous reaction, the H2O2 concentration reaches 656.8 mM (2.2 wt %), a concentration close to medical-use requirements. The findings provide a strategy for practical photocatalytic H2O2 production by regulating both excitonic properties and O2 adsorption behavior in photocatalysts.<\/jats:p>","DOI":"10.1021\/acsnano.6c11575","type":"journal-article","created":{"date-parts":[[2026,9,2]],"date-time":"2026-09-02T05:34:34Z","timestamp":1788327274000},"page":"25078-25089","source":"Crossref","is-referenced-by-count":1,"title":["Photocatalytic Production\nof over 2 wt % Hydrogen\nPeroxide Solution via Potassium-Ion Regulation of Nitrogen-Rich Carbon\nNitride"],"prefix":"10.1021","volume":"20","author":[{"given":"Xinfei","family":"Zhang","sequence":"first","affiliation":[{"name":"Zhengzhou University , , 100 Kexue Avenue , , ,","place":["Zhengzhou, Henan, China, 450001"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuliang","family":"Wu","sequence":"additional","affiliation":[{"name":"Guangdong University of Technology , , ,","place":["Guangzhou, China, 510006"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Honghao","family":"Xie","sequence":"additional","affiliation":[{"name":"Guangdong University of Technology , , ,","place":["Guangzhou, China, 510006"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianing","family":"Lin","sequence":"additional","affiliation":[{"name":"Shandong University , , ,","place":["Qingdao, China, 266237"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ming","family":"Dou","sequence":"additional","affiliation":[{"name":"Zhengzhou University , , 100 Kexue Avenue , , ,","place":["Zhengzhou, Henan, China, 450001"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"Zhang","sequence":"additional","affiliation":[{"name":"Zhengzhou University , , 100 Kexue Avenue , , ,","place":["Zhengzhou, Henan, China, 450001"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ping","family":"Chen","sequence":"additional","affiliation":[{"name":"The University of Queensland , , St Lucia , , ,","place":["Brisbane, QLD, Australia, 4072"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9139-9835","authenticated-orcid":true,"given":"Jingwei","family":"Hou","sequence":"additional","affiliation":[{"name":"The University of Queensland , , St Lucia , , ,","place":["Brisbane, QLD, Australia, 4072"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2751-483X","authenticated-orcid":true,"given":"Bin","family":"Han","sequence":"additional","affiliation":[{"name":"Guangdong University of Technology , , ,","place":["Guangzhou, China, 510006"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lianzhou","family":"Wang","sequence":"additional","affiliation":[{"name":"The University of Queensland , , St Lucia , , ,","place":["Brisbane, QLD, Australia, 4072"]},{"name":"The Hong Kong Polytechnic University , , Hung Hom , , ,","place":["Kowloon, Hong Kong SAR, China, 999077"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2139-8495","authenticated-orcid":true,"given":"Zhiliang","family":"Wang","sequence":"additional","affiliation":[{"name":"The University of Queensland , , St Lucia , , ,","place":["Brisbane, QLD, Australia, 4072"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0893-5041","authenticated-orcid":true,"given":"Yuan","family":"Zhang","sequence":"additional","affiliation":[{"name":"Guangdong University of Technology , , ,","place":["Guangzhou, China, 510006"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,8,28]]},"reference":[{"key":"2026091510110869400_cit1","doi-asserted-by":"publisher","first-page":"542","DOI":"10.1038\/s41893-025-01538-4","article-title":"Stable and\nHigh-Yield Hydrogen Peroxide Electrosynthesis from Seawater","volume":"8","author":"Zhang","year":"2025","journal-title":"Nat. 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Energy Mater."},{"key":"2026091510110869400_cit44","doi-asserted-by":"publisher","DOI":"10.1002\/anie.202425656","article-title":"Spatially Separated\nRedox Centers in Anthraquinone-grafted Metal-Organic Frameworks for\nEfficient Piezo-photocatalytic H2O2 Production","volume":"64","author":"Chen","year":"2025","journal-title":"Angew. Chem., Int. Ed."},{"key":"2026091510110869400_cit45","doi-asserted-by":"publisher","DOI":"10.1016\/j.cej.2024.151585","article-title":"Selective Degradation of Organic\nPollutants by Highly Dispersed Fe, Ni Anchored on Nitrogen Carbon\nActivating Persulfate System: Electron Transfer Promotion, the Impact\nof Pollutant Redox and Adsorption Properties","volume":"490","author":"Liu","year":"2024","journal-title":"Chem. Eng. 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Mater."},{"key":"2026091510110869400_cit48","doi-asserted-by":"publisher","DOI":"10.1038\/s41467-024-52158-z","article-title":"Merging\nSemi-Crystallization\nand Multispecies Iodine Intercalation at Photo-Redox Interfaces for\nDual High-Value Synthesis","volume":"15","author":"Chen","year":"2024","journal-title":"Nat. Commun."},{"key":"2026091510110869400_cit49","doi-asserted-by":"publisher","DOI":"10.1038\/s41467-024-49046-x","article-title":"Circumventing\nBottlenecks in H2O2 Photosynthesis over Carbon\nNitride with Iodine Redox Chemistry and Electric Field Effects","volume":"15","author":"Bai","year":"2024","journal-title":"Nat. Commun."},{"key":"2026091510110869400_cit50","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202304967","article-title":"Rational Design of Orally Administered\nCascade Nanozyme for Inflammatory\nBowel Disease Therapy","volume":"35","author":"Yu","year":"2023","journal-title":"Adv. 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