Preparation and Electrochemical Properties of GO/NiMoO4 Nanocomposites
The NiMoO4 nanorod precursors were prepared by hydrothermal method,and then the ultra-long NiMoO4 nano-rods (10 μm) were prepared by calcination,and the NiMoO4 nanorods were uniformly attached to the graphene oxide sur-face by ultrasonic method to prepare GO/NiMoO4 composites. The surface morphology and elemental composition of the ma-terials were studied by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The electro-chemical properties of the GO/NiMoO4 nanocomposites were analyzed by cyclic voltammetry,constant current charge/dis-charge,impedance and cyclic charge/discharge tests in a 3 mol/L KOH electrolyte system. The experimental results show that the specific capacity calculated from the constant current charge/discharge curves,the GO/NiMoO4 electrode shows a high specific capacity of 721 F/g at 1 A/g,which is much higher than that of the original NiMoO4 electrode of 405 F/g,the specific capacity calculated from the cyclic voltammetry curves,compared with the original NiMoO4 electrode,the GO/Ni-MoO4 electrode shows a significantly enhanced. The specific capacitance can be as high as 1334 F/g,1171 F/g,896 F/g,750 F/g,646 F/g and 567 F/g (at 5 mV/s,10 mV/s,20 mV/s,30 mV/s,40 mV/s and 50 mV/s),and the capacity reten-tion rate of GO/NiMoO4 reaches 87.3％ at a current density of 20 A/g for 10000 cycles,which is much higher than that of NiMoO4 at 66.9％. The capacity retention of GO/NiMoO4 was 87.3％ which was much higher than that of NiMoO4 (66.9％). The preparation of GO/NiMoO4 nanocomposites by this simple method provides a promising direction for the selection of fu-ture high-performance supercapacitor electrode materials,and the excellent performance makes it useful for future practi-cal applications.
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