Influence of metallic oxide on the morphology and enhanced supercapacitive performance of NiMoO4 electrode material

Transition metal oxide modified NiMoO 4 supercapacitor electrode materials were prepared by a simple solvothermal method. The effects of MnMoO 4 , ZnMoO 4 and CoMoO 4 on the structure, morphology and electrochemical performance of NiMoO 4 materials were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), Raman, laser particle size analyzer, and electrochemical measurements. The results indicate that the metal oxides have significant influence on the morphology of NiMoO 4 . The NiMoO 4 , NiMoO 4 /MnMoO 4 , NiMoO 4 /ZnMoO 4 and NiMoO 4 /CoMoO 4 materials present pine needle-like, micron rod-like, ramotan fruit-like and coral cluster-like can be prepared by using three different transition metal oxides with the same experimental parameters. At the current density of 1 A g −1 , the discharge specific capacitance is 620, 430, 556 and 740 F g −1 , respectively. After 2000 charge and discharge cycles, the capacitance retention rate is as high as 99.4, 60.1, 96.0 and 89.1% with current density of 10 A g −1 , respectively. Compared with the other three morphologies, the coral cluster-like NiMoO 4 /CoMoO 4 composite structure provides more space and redox active sites, which could improve electrolyte diffusion efficiency and enhance electron transport.