Three-dimensional nanostructures of multiwalled carbon nanotubes/graphene oxide/TiO_2 nanotubes for supercapacitor applications

摘要

R(fMWCNT-GO)/TiO_2NTs/Ti electrodes with three-dimensional nanostructures were prepared by co-electrochemical reduction of functionalized multiwalled carbon nanotubes (fMWCNTs) and graphene oxide (GO) onto TiO_2 nanotubes/Ti. SEM studies revealed that the reduced fMWCNT-GO hybrid with highly network structures has been uniformly deposited onto the TiO_2NTs arrays. The storage energy performance was investigated by cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy techniques in 1.0 M H_2SO_4 aqueous solution. The R(fMWCNT-GO)/ TiO_2NTs/Ti electrodes exhibit a high specific capacitance up to 600 F g~(-1) at 12 A g~(-1) in 1 M H_2SO_4 and a long cyclic durability with 90 % capacitance retention over 500 cycling, indicating a potential application in electrode material of supercapacitors. The high capacitance of R(GO-fMWCNT)/TiO_2NTs electrode could be attributed to the functional groups of GO-fMWCNT, the 3D structures of the electrode and the highly electrical conductivity fMWCNT.