Application of fully conjugated covalent organic frameworks in photocatalytic carbon dioxide reduction performance

Photocatalytic reduction of carbon dioxide into useful feedstocks has attracted increasing attention. In this study, a fully conjugated COF material COF-TMT-A with the main structure containing an alkyne group and triazine part was synthesized using sp(2)-carbon-carbon double bond (CvC) linked COF as a research target. The prepared COF materials were characterized in detail by FT-IR, PXRD, and C-13 solidstate NMR. The introduction of an alkyne group not only enhanced the conjugated pi-electron leaving domain but also optimized the electronic band structure and significantly improved the photocatalytic activity. The selectivity for the product HCOO was as high as 99%. A 10 h photocatalytic CO(2 )reduction experiment was carried out, and COF-TMT-A showed a significantly higher HCOO- yield of about 43 mu mol compared with COF-701 and the ligand.