Junkang Ge, Jun Zhao, Lei Li, Zhihao Li, Hui Wang, Xiaodong Zhang, Yi Xie
{"title":"促进阴阳离子共掺聚合物半导体中的激子解离以实现选择性氧化反应","authors":"Junkang Ge, Jun Zhao, Lei Li, Zhihao Li, Hui Wang, Xiaodong Zhang, Yi Xie","doi":"10.1039/d4sc04201h","DOIUrl":null,"url":null,"abstract":"The inherent low dielectric properties and weak shielding effect of polymeric semiconductors result in excitons dominating their photoexcitation process, which greatly restricts the charge carriers mediated photocatalytic performances. Here, an anion and cation co-doping strategy was proposed to weaken the binding energy of excitons by forming distinguished positive and negative charge regions, where the charge asymmetry will give birth to an external potential to drive exciton dissociation. By taking polymeric carbon nitride as a typical model framework, we show that the incorporation of anion (Cl-, Br-, I-) and cation (Na+, K+) ions could create a significant spatial separation of electrons and holes, thereby promoting exciton dissociation. In detail, K+ and Cl- co-doped polymeric carbon nitride could effectively promote the dissociation of exciton into hot carriers, contributing to outstanding efficiency in hot-electron-involved photocatalytic processes such as superoxide radicals (O2•-) generation and phenyl boric acid oxidation under visible-light. This work presents a practical approach for promoting excitons dissociation by charge asymmetry introduction.","PeriodicalId":9909,"journal":{"name":"Chemical Science","volume":null,"pages":null},"PeriodicalIF":7.6000,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Boosting excitons dissociation in anion and cation co-doped polymeric semiconductor for selective oxidation reaction\",\"authors\":\"Junkang Ge, Jun Zhao, Lei Li, Zhihao Li, Hui Wang, Xiaodong Zhang, Yi Xie\",\"doi\":\"10.1039/d4sc04201h\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The inherent low dielectric properties and weak shielding effect of polymeric semiconductors result in excitons dominating their photoexcitation process, which greatly restricts the charge carriers mediated photocatalytic performances. Here, an anion and cation co-doping strategy was proposed to weaken the binding energy of excitons by forming distinguished positive and negative charge regions, where the charge asymmetry will give birth to an external potential to drive exciton dissociation. By taking polymeric carbon nitride as a typical model framework, we show that the incorporation of anion (Cl-, Br-, I-) and cation (Na+, K+) ions could create a significant spatial separation of electrons and holes, thereby promoting exciton dissociation. In detail, K+ and Cl- co-doped polymeric carbon nitride could effectively promote the dissociation of exciton into hot carriers, contributing to outstanding efficiency in hot-electron-involved photocatalytic processes such as superoxide radicals (O2•-) generation and phenyl boric acid oxidation under visible-light. This work presents a practical approach for promoting excitons dissociation by charge asymmetry introduction.\",\"PeriodicalId\":9909,\"journal\":{\"name\":\"Chemical Science\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":7.6000,\"publicationDate\":\"2024-10-04\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Chemical Science\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://doi.org/10.1039/d4sc04201h\",\"RegionNum\":1,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chemical Science","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1039/d4sc04201h","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
Boosting excitons dissociation in anion and cation co-doped polymeric semiconductor for selective oxidation reaction
The inherent low dielectric properties and weak shielding effect of polymeric semiconductors result in excitons dominating their photoexcitation process, which greatly restricts the charge carriers mediated photocatalytic performances. Here, an anion and cation co-doping strategy was proposed to weaken the binding energy of excitons by forming distinguished positive and negative charge regions, where the charge asymmetry will give birth to an external potential to drive exciton dissociation. By taking polymeric carbon nitride as a typical model framework, we show that the incorporation of anion (Cl-, Br-, I-) and cation (Na+, K+) ions could create a significant spatial separation of electrons and holes, thereby promoting exciton dissociation. In detail, K+ and Cl- co-doped polymeric carbon nitride could effectively promote the dissociation of exciton into hot carriers, contributing to outstanding efficiency in hot-electron-involved photocatalytic processes such as superoxide radicals (O2•-) generation and phenyl boric acid oxidation under visible-light. This work presents a practical approach for promoting excitons dissociation by charge asymmetry introduction.
期刊介绍:
Chemical Science is a journal that encompasses various disciplines within the chemical sciences. Its scope includes publishing ground-breaking research with significant implications for its respective field, as well as appealing to a wider audience in related areas. To be considered for publication, articles must showcase innovative and original advances in their field of study and be presented in a manner that is understandable to scientists from diverse backgrounds. However, the journal generally does not publish highly specialized research.