| 초록 |
In the present work, sponge-like graphene oxide/carbon nanotubes foam (SGCF) was prepared through sonication and freeze-dry process of GO/CNT dispersion in water-ethanol system. The as-prepared SGCF possesses holey structure, leading to providing highly effective electrolyte pathway. Reduced SGCF (rSGCF) which can be used as electrode in supercapacitor can be prepared by annealing the SGCF without distinct deformation. The characterization of SGCF and rSGCF was performed by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, and scanning electron microscopy. The electrochemical measurements of rSGCF were performed by cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy. The rSGCF electrode showed excellent rate capability and cycling stability owing to its high electrical conductivity and superior structural stability. |
