H_2O_2活化聚酰亚胺碳纳米纤维无纺布及其储电性能

H_2O_2-Activated Polyimide-Based Carbon Nanofiber Non-Woven Fabrics and Their Capacitances

聚酰亚胺碳纳米纤维无纺布经双氧水在氮气氛中750℃活化,使其比表面积增大,从而改善其储电性能.通过透射电镜观察活性碳纳米纤维的尺寸、形貌和结构;采用次甲基蓝水溶液吸附法测定活化碳纳米纤维的比表面积;用CHI660B电化学工作站测定该活性碳纳米纤维电极的储电性能.结果显示:活化后碳纳米纤维具有更大的比表面积,表面粗糙,电极材料的储电性能随活化程度的提高而增大;聚酰亚胺碳纳米纤维电极具有良好的超级电容器特性,在1 mol/L的H2SO4电解液中,经6 h活化后的碳纳米纤维电极具有良好的电荷储存能力,比电容量达到174.2 F/g.

The polyimide-based carbon nanofiber non-woven fabrics were activated at 750 ℃ with H2O2 in nitrogen atmosphere to increase their specific surface areas and their capacitances. Transmission electron microscope was used to observe the size, morphology, and structure of the activated polyimide-based carbon nanofibers. Methylene blue solution adsorption method was used to measure the specific surface area of the carbon nanofibers. CHI660B electrochemical workstation was used to characterize the chargestoring capacity of the polyimide-based carbon nanofiber electrodes in supercapacitor. Experimental resuits show that higher activating degree of the nanofibers results in higher specific surface area and a better capacitance performance of carbon nanofiber electrodes. The capacitance of 174.2 F/g was obtained after activation for 6 h when 1 mol/L H2SO4 was used as the electrolyte.