Fankai Bu, Runzhi Yuan, Zejun Zhang, Jun Wang, Junying Liu and Yang-Chun Yong
{"title":"Viologen doping induced charge storage in carbon nitride for enhanced photocatalytic hydrogen production†","authors":"Fankai Bu, Runzhi Yuan, Zejun Zhang, Jun Wang, Junying Liu and Yang-Chun Yong","doi":"10.1039/D4QI02386B","DOIUrl":null,"url":null,"abstract":"<p >The rapid recombination of photogenerated charges is the primary bottleneck hindering photocatalytic hydrogen generation with graphitic carbon nitride (g-C<small><sub>3</sub></small>N<small><sub>4</sub></small>). Herein, by introducing methyl viologen (MV) into the carbon nitride framework, CN-MV-<em>x</em> with enhanced photoinduced charge carrier separation is fabricated. The surface chemistry and photoelectrochemical properties of CN-MV-<em>x</em> samples are greatly enhanced. Owing to the increased charge separation with electron extraction by doped MV, the highest hydrogen evolution rate of 1.65 mmol g<small><sup>−1</sup></small> h<small><sup>−1</sup></small> is achieved by the CN-MV-<em>x</em> photocatalyst doped with 10 mmol MV (CN-MV-10). More impressively, CN-MV-10 also shows an extraordinary electron storage ability, which powers time-delayed hydrogen production in the dark after light illumination. Further analysis indicates that this time-delayed hydrogen evolution ability is ascribed to electron accumulation in the conduction band of carbon nitride. This study provides a new route to improve photoinduced charge separation by introducing redox species.</p>","PeriodicalId":79,"journal":{"name":"Inorganic Chemistry Frontiers","volume":" 2","pages":" 801-811"},"PeriodicalIF":6.1000,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Inorganic Chemistry Frontiers","FirstCategoryId":"92","ListUrlMain":"https://pubs.rsc.org/en/content/articlelanding/2025/qi/d4qi02386b","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
引用次数: 0
Abstract
The rapid recombination of photogenerated charges is the primary bottleneck hindering photocatalytic hydrogen generation with graphitic carbon nitride (g-C3N4). Herein, by introducing methyl viologen (MV) into the carbon nitride framework, CN-MV-x with enhanced photoinduced charge carrier separation is fabricated. The surface chemistry and photoelectrochemical properties of CN-MV-x samples are greatly enhanced. Owing to the increased charge separation with electron extraction by doped MV, the highest hydrogen evolution rate of 1.65 mmol g−1 h−1 is achieved by the CN-MV-x photocatalyst doped with 10 mmol MV (CN-MV-10). More impressively, CN-MV-10 also shows an extraordinary electron storage ability, which powers time-delayed hydrogen production in the dark after light illumination. Further analysis indicates that this time-delayed hydrogen evolution ability is ascribed to electron accumulation in the conduction band of carbon nitride. This study provides a new route to improve photoinduced charge separation by introducing redox species.