{"title":"Hollow sp2-conjugated covalent organic framework encapsulating thiophene-based photosensitizer for enhanced visible-light-driven hydrogen evolution","authors":"Chen Yang, Huawei Hu, Cheng Qian, Yaozu Liao","doi":"10.22541/au.169050788.87912365/v1","DOIUrl":null,"url":null,"abstract":"Vinylene-linked covalent organic frameworks (COFs) have gained increasing attention for photocatalytic hydrogen evolution. However, the photocatalytic activity of vinylene-linked COFs has been restricted due to low exciton dissociation efficiency and wide band gap. Herein, we fabricated a novel p-n type Z-scheme heterostructure, g2T-T@HCOFs, through the hybridization of vinylene-linked COFs with a hollow structure and thiophene-based photosensitizer (g2T-T) using a template method and post-encapsulating modification. The hollow-structured HCOFs enable uniform encapsulation of the g2T-T both within their channels and on their surfaces, which facilitates the formation of a firm and stable interface between n-type HCOF and p-type g2T-T. Therefore, the encapsulation of g2T-T enables the realization of a Z-scheme pathway for efficient charge separation and transfer, leading to enhanced electron accumulation within the HCOFs during water splitting. Consequently, the obtained p-n type Z-scheme heterostructure g2T-T@HCOFs exhibit a remarkable 5.5-fold enhancement in visi-ble-light-induced hydrogen evolution activity compared to the pristine COF.","PeriodicalId":487619,"journal":{"name":"Authorea (Authorea)","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2023-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Authorea (Authorea)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.22541/au.169050788.87912365/v1","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Vinylene-linked covalent organic frameworks (COFs) have gained increasing attention for photocatalytic hydrogen evolution. However, the photocatalytic activity of vinylene-linked COFs has been restricted due to low exciton dissociation efficiency and wide band gap. Herein, we fabricated a novel p-n type Z-scheme heterostructure, g2T-T@HCOFs, through the hybridization of vinylene-linked COFs with a hollow structure and thiophene-based photosensitizer (g2T-T) using a template method and post-encapsulating modification. The hollow-structured HCOFs enable uniform encapsulation of the g2T-T both within their channels and on their surfaces, which facilitates the formation of a firm and stable interface between n-type HCOF and p-type g2T-T. Therefore, the encapsulation of g2T-T enables the realization of a Z-scheme pathway for efficient charge separation and transfer, leading to enhanced electron accumulation within the HCOFs during water splitting. Consequently, the obtained p-n type Z-scheme heterostructure g2T-T@HCOFs exhibit a remarkable 5.5-fold enhancement in visi-ble-light-induced hydrogen evolution activity compared to the pristine COF.