Solvothermal synthesis of triphenylamine-based covalent organic framework nanofibers with excellent cycle stability for supercapacitor electrodes

Covalent organic framework (COF) is a new class of porous materials used in energy storage devices. By solvothermal method, the triphenylamine-based covalent organic framework was synthesized using Schiff base coupling reaction between tris(4-aminophenyl) amine (TAPA) and tris(4-formylphenyl) amine. The regular pore structure of TPA-COFs not only exposes more active sites of triphenylamine structure to electrolyte solution during the charge-discharge process, but also accelerates the transport of ions in the active layer. At the same time, the pi-electron conjugated system and the interlayer pi-pi stacking effect effectively promote the conduct of electrons in the two-dimensional and three-dimensional directions of COFs materials, which improves the electrochemical performance of the materials. TPA-COFs show a higher specific capacitance of 263.1 F/g at 0.1 A/g. At the same time, TPA-COFs materials exhibit a high specific surface area of 398.59 m(2)/g. After 5000 cycles of charge-discharge, the capacitance retention rate of TPA-COFs is 111%, showing excellent cycle stability.

Automated summary

Covalent organic framework (COF) is a new class of porous materials used in energy storage devices, with a regular pore structure and excellent electrochemical performance that enhance the cycle stability and specific capacitance of the materials.