共价有机框架/多壁碳纳米管复合材料及其双电层电容器性能

Covalent Organic Frameworks/Multi-Walled Carbon Nanotubes Composite and Its Electric Double-Layer Capacitor Properties

共价有机框架(COF)材料是一种特殊的结晶性有机多孔材料,具有多种有机官能团结构,同时有着非常低的骨架密度以及较高的比表面积。通过熔融热法制备TpPa-COF材料并与导电性能优异的多壁碳纳米管(MWCNT)复合制得TpPa-COF@MWCNT纳米复合材料,复合材料的微观形貌通过扫描电子显微镜(SEM)和透射电子显微镜(TEM)进行表征,通过循环伏安法对用于超级电容器的TpPa-COF@MWCNT纳米复合材料的电化学性能进行研究。实验验证了该复合材料在不同扫描速度下的循环伏安曲线均呈现优异的双电层电容特性。当电流密度高达1 A·g-1时,该复合材料的比电容仍达到25 F·g-1,在2 A·g-1的电流密度下测得5 000次循环后比电容的保持率略高于100%,表现出良好的大电流充放电性能和应用前景。

Covalent organic framework(COF)is a special crystalline organic porous material,and has a variety of organic functional groups,a very low skeletal density and higher specific surface area.By compounding the TpPa-COF and multi-walled carbon nanotube(MWCNT)with excellent conductivity,the TpPa-COF@MWCNT nano composites were prepared using the thermal method.The micro-morphology of the composites was characterized by the scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The electrochemical performances of the TpPa-COF@MWCNT nano composites used for supercapacitor were studied by the cyclic voltammetric method.The experimental result shows that the cyclic voltammetry curves exhibit excellent electric double layer capacitance characteristics at various scanning rates.The specific capacitance of the composites reaches 25 F·g-1 at the current density of 1 A·g-1,and the retention rate of the specific capacitance slightly exceeds 100% measured at the current density of 2 A·g-1 after 5 000 cycles,showing good high current charge and discharge characteristic and good application prospects.