Highly dispersed Co-modified covalent organic frameworks as bridging cocatalysts for boosting CO2 photoreduction over defective carbon nitride. Issue 9 (8th February 2023)

• Record Type: Journal Article
• Authors: Qiu, Jinyu; Zheng, Yanxia; Wang, Lanxin; Liu, Meng; Tian, Lintao; Yu, Xuelian; An, Xiaoqiang; Lv, Guocheng
• Is Part Of: Journal of materials chemistry. Volume 11:Issue 9(2023)
• Page Start: 4572
• Page End: 4578
• Publication Date: 2023-02-08
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta09140b
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : TpTta COF with efficient electron mobility traps electrons from the photosensitizer, and efficiently transfers them to the Co center to improve the photocatalytic CO2 reduction performance. Abstract : It is still a great challenge to increase both the active sites and charge separation of earth-abundant catalysts for efficient and durable photocatalytic CO2 conversion. To achieve these aims, we designed imine-linked covalent organic frameworks as the electron bridge that links the photocatalyst and robust metal active sites for photocatalytic CO2 reduction. When integrated with defective g-C3 N4, the composite generated 37.3 μmol h −1 of CO with 98.8% selectivity over H2 evolution under visible light irradiation, which greatly outperformed other non-noble metal species as cocatalysts. Experimental and theoretical results demonstrated that the stabilized Co ions with a six-membered chelating structure effectively improved the collection of excited electrons and stability of the catalyst. This study provides a new protocol to improve CO2 photoreduction performance through coupling defect-modulated photocatalysts with bridging cocatalysts.