High Temperature Modified Covalent Triazine Framework for High-efficiency and Ultra-cycle Stable Symmetric Supercapacitor

The high temperature modified covalent triazine framework (CTF-600) can exhibit the upmost specific capacitance of 458 F/g at 0.25 A/g, owing to the increased conductivity and suitable pore structure, accompanied by the inherent advantage of CTF. The corresponding symmetric CTF-600//CTF-600 supercapacitor exhibits the energy density of 8 Wh/kg, and excellent cycle stability such as no significant decline of capacitance retention after 10000 cycles. Therefore, the calcinated CTF can be identified as a promising electrode material for supercapacitors. The CTF obtained by the simple ionothermal route was treated by high temperature to improve the conductivity and adjust the pore structure, which suitable for electron and ion transfer. The assembled CTF-600//CTF-600 symmetric supercapacitor can exhibit the energy density of 8 Wh/kg at 250 W/kg, especially for the excellent cycle stability (no significant decline of capacitance retention after 10000 cycles).