Covalent triazine frameworks based on different stacking model as electrocatalyst for hydrogen evolution

Abstract

Two-dimensional covalent triazine frameworks (2D-CTFs) are nitrogen-rich conjugated porous polymers with high porosity, adjustable electronic properties and abundant active sites, which are conducive to electrochemical water-splitting. In this work, two kinds of high crystallinity Covalent triazine frameworks (CTFs) with AA and AB stacking models were synthesized by super acid catalytic and crystal transfer via annealing, and this method was extended to fluorinated CTFs. The unique π -conjugated 1D channel in CTFs provide favorable conditions for electron transport and mass diffusion during hydrogen evolution. The catalytic kinetic analysis shows that the catalytic performance of CTFs is related to the stacking configuration. When CTFs are converted into AA stacking, the electrocatalytic activity of CTFs are enhance significantly. Meanwhile, the electrocatalytic performance of CTFs is improved obviously after fluorination. This work provides a more promising direction for finding high activity, stable and cheap electrochemical hydrogen evolution catalysts by changing the stacking patterns.