离子热法合成二维共价有机框架材料及其电化学性能

Synthesis and Electrochemical Properties of Two-dimensional Covalent Organic Frameworks by Ionothermal Method

以离子液体1-乙基-3-甲基咪唑鎓硫酸乙酯盐([Emim]ESe)为溶剂,通过常压缩聚合成两种二维(2D)共价有机框架材料(COFs),分别被记为BTA-TAPT COF和TFPB-TAPT COF。将TFPB-TAPT COF材料组装到三电极体系中,对该材料的电化学性能进行研究。结果表明:在电压窗口为0~1 V,电流密度为0.5 A/g时,质量比电容为96 F/g。此外,TFPB-TAPT COF材料表现出良好的循环稳定性,在电流密度为0.5 A/g下循环5000次,具有93 F/g的初始质量比电容,经5000次循环后仍有62 F/g(初始值的67%)的质量比电容。

Two types of two-dimensional(2D)covalent organic frameworks(COFs)were synthesized by polycondensation at atmospheric pressure using the ionic liquid 1-ethyl-3-methylimidazole-ethyl sulfate([Emim]ESe)as a solvent,which were named as BTA-TAPT COF and TFPB-TAPT COF,respectively.The electrochemical properties of TFPB-TAPT COF were investigated by assembling the material into a three-electrode system.The mass specific capacitance of TFPB-TAPT COF was 96 F/g,when the voltage window was 0~1 V and the current density was 0.5 A/g.In addition,TFPB-TAPT COF material shows good cycling stability.At a current density of 0.5 A/g for 5000 cycles,TFPB-TAPT COF material has an initial mass specific capacitance of 93 F/g,and still has a mass specific capacitance of 62 F/g(67%of the initial value)after 5000 cycles.