Electrochemical properties of MnO2/CNT nanocomposite in neutral aqueous electrolyte as cathode material for asymmetric supercapacitors

摘要

A MnO_(2)/carbon nanotube(CNT)nanocomposite was synthesised using a simple hydrothermal treatment.The nanocomposite exhibits a CNT core/MnO_(2)porous sheath hierarchy architecture,which makes it promising as an electrode material for supercapacitors.An asymmetric supercapacitor based on activated carbon(AC)as anode,MnO_(2)/CNT nanocomposite as cathode and 1M Na_(2)SO_(4)solution as electrolyte was assembled in a Swagelok cell.The full cell exhibits excellent power capability,cycling stability and a high energy density of 23 W h/kg at a power density of 330 W/kg based on the total mass of the active electrode materials.This AC//MnO_(2)/CNT asymmetric supercapacitor is promising for high-power applications due to its high energy density and power density.