Abstract:
Ni(OH)
2-carbon nanotubes-reduced graphene oxide (Ni(OH)
2-CNTs-RGO) ternary composites were synthesized by simple and practicable one-pot hydrothermal synthesis method. The influence of different reaction temperatures on properties of composite materials was researched. The microstructure and morphology of Ni(OH)
2-CNTs-RGO composites were characterized by XRD, FTIR, Raman spectroscopy, X-ray photoelectron spectroscopy(XPS), SEM and TEM. The electrochemical characteristics of Ni(OH)
2-CNTs-RGO electrode composites were tested by cyclic voltammetry(CV), electrochemical impedance spectroscopy(EIS) and galvanostatic charge/discharge. The results show that the prepared Ni(OH)
2-CNTs-RGO composite has large specific surface area and 3D network structure when the reaction temperature is 120℃. The synthesized Ni(OH)
2-CNTs-RGO composite shows that hexagonal β-Ni(OH)
2 nano sheets and CNTs are homogeneously dispersed and inserted into RGO sheets. The Ni(OH)
2-CNTs-RGO electrode composite exhibits the discharge specific capacity up to 362.8 mAh/g at 0.2 C and 286.2 mAh/g at 5 C, which is still higher than the specific capacity of Ni(OH)
2. The CNTs and RGO collaborative role effectively improves the conductivity of the electrode material and the utilization of active material. Finally, the rate performance of Ni(OH)
2-CNTs-RGO composite is improved.
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