Characteristics and Electrochemical Performance of Supercapacitors with Manganese Oxide-Carbon Nanotube Nanocomposite Electrodes

Abstract

Supercapacitor characteristics of manganese oxide/nickel and manganese oxide/carbon nanotubes/nickel nanocomposite electrodes were investigated in this study. The CNTs were deposited on the Ni substrate by electrophoresis in a dimethylformamide solution, whereas the were synthesized by anodic deposition in a manganese sulfate pentahydrate aqueous solution on substrates. The crystallinity and surface morphology of these electrodes were determined by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The capacitive properties of these electrodes were demonstrated by cyclic voltammetry with scan rates ranging from . The specific capacitances of the nanocomposite electrode were 415 and with scan rates of 5 and , respectively. After of operation, this electrode can maintain 79% of its original capacitance. These nanocomposite electrodes possessing good electrochemical reversibility and high capacitance may be appropriate for supercapacitor application in the future.