Solvothermal synthesis and supercapacitive properties of highly electrochemical stable covalent organic frameworks with triazine building block

Abstract

Supercapacitors have been widely studied as a typical representative of new energy storage systems. As a type of novel crystalline porous material, covalent triazine frameworks (CTFs) have attracted enormous attention owing to their high nitrogen content and unique triazine ring structure, which give them high chemical and thermal stability. In this paper, 2,4,6-tris(4-aldophenyl)-1,3,5-triazine (TFPT) and 2,4,6-tris(4-aminophenyl)-1,3,5-triazine (TAPT) were used to synthesize TPT-CTFs by Schiff base reaction. TPT-CTFs exhibit regular nanosheets structure and high crystallinity. The specific capacitance of TPT-CTFs is 110 F/g at current density of 0.1 A/g. After 10,000 cycles of charge and discharge, the capacitance retention rate is high as 105%, due to the high crystallinity support and expandable channels of TPT-CTFs. In addition, the simple and convenient one-pot hydrothermal synthesis used in this paper, avoids harsh conditions of common ampoule methods for synthesis of CTFs materials.