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Free-standing flexible supercapacitive electrodes have practical application for wearable energy storage devices. In this paper, graphene paper (GP), a flexible electrode substrate, was prepared by one-step reduction of graphene oxide (GO) using HI solution. GP can be used independently as a flexible electrode with specific capacitance of 227 F/g. In order to make up for the shortage of GP specific capacitance storage, polyaniline (PANI) with high specific capacitance and good electrical conductivity was selected to composite with GP by electrochemical polymerization approach. This method to fabricate electrode material by direct electrochemical polymerization avoids the use of conductive binder and organic solvent. Owing to the specific capacitance contribution of PANI and GP, the PANI/GP composites exhibit higher specific capacitance when the polymerization time is 30 s and the polymerization voltage is 0.8 V. At 1 A/g current density, the specific capacitance of composite is up to 759 F/g, which is 3.34 times of neat GP.

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.

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