Fully conjugated two-dimensional sp2-carbon covalent organic frameworks for efficient photocatalytic hydrogen generation

In this paper, two types of conjugated, triazine-based covalent organic frameworks (COFs) with different connected linkages (imine bond and sp2-carbon-CN bond) are presented. The insignificant difference in the linkages creates a remarkable difference in their performance in visible-light-driven hydrogen generation. The fully π-conjugated two-dimensional (2D) COF with sp2-carbon-CN linkages showed an external quantum efficiency of 13.48