Structures and electrochemical performances of activated carbon fiber/NiO/MnO_2 composite electrodes

Composite electrodes of ACF/NiO/MnO2 were prepared by sol-gel method.The scanning electric microscopy,wide angle X-ray diffraction,isothermal adsorption,cyclic voltammetry and constant current charge-discharge measurements were used to detect their morphology,crystal structures and specific surface area,as well as electrochemical performances,respectively.The oxides of Ni and Mn loaded randomly on the surface of ACF are amorphous.The maximum specific capacity can be up to 290.2 F/g when the composite electrodes were prepared at 400 ℃ with the molar ratio of Ni to Mn 3:1 and the load of NiO/MnO2 3.9%,which is 1.3 times higher than that of ACF.