| 초록 |
Supercapacitor is strong energy storage devices, which have high power density and long cycle stability. Carbon nanotubes are a promising material due to excellent electrical conductivity and high specific surface area. However, Pristine carbon nanotubes(p-CNT) was limited by the aggregation into bundles due to van der Waals force and low capacitance attributable to non-faradaic mechanism. We investigated the effect of various functional groups such as carboxyl, sulfonic, and amine groups on the performance of multi-walled carbon nanotubes(MWCNT). p-CNT and functionalized MWCNTs(f-CNT) were characterized by FT-IR, Raman, and XPS.The electrochemical performances such as the specific capacitance, cycle stability were studied by cyclic voltammetry(CV) and charge-discharge curves. The f-CNT increased the capacitance due to functional groups while maintaining good dispersion and electrical conductivity.This research provides an effective method to improve the capacitor performance of p-CNT. |
