Carbon nanotubes-reduced graphene oxide(CNTs-rGO)three-dimensional aerogels were prepared using hydroxylated carbon nanotubes(CNT-OH)and graphene oxide(GO)as raw materials through redox self-assembly hydrothermal synthesis strategy.The effect of hydrothermal temperature on three-dimensional aerogels was investi-gated.The structure and morphology of the materials were characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD),Raman spectroscopy(Raman)and X-ray photoelectron spectroscopy(XPS).The electro-chemical test results indicate that the aerogel CNTs-rGO synthesized at 140 ℃ showed the best electrochemical performance,the specific capacitance at 1 A·g-1 current density was up to 294.65 F·g-1,and the shape of cyclic voltammetry curve at 50 mV·s-1 scanning speed was still similar to a rectangle,showing good reversibility.The assembled symmetrical supercapacitor had a maximum energy density of 3.744 Wh·kg-1 at a power density of 249.8 W·kg-1.After 10 000 cycles at 1 A·g-1,its capacitance retention and Coulombic efficiency were both about 100％.The excellent electrochemical performance is mainly attributed to the porous three-dimensional structure of CNTs-rGO composite material,which ensures rapid ion transport.Carbon nanotubes can not only overcome the sheet stacking problem of graphene,but also increase the specific surface area of the composite material,increase the reactive sites,and improve its electrochemical properties;at the same time,it can also provide electron transport channels and improve the conductivity of the material,so that the composite material has better mechanical and electrochemical properties.
NETL
NSTL
万方数据
维普
