High capacity NiCo2O4 nanorods as electrode materials for supercapacitor

We demonstrate a novel and scalable route for synthesizing NiCo2O4 nanorods via solid state reactions at room temperature coupled with a simple post annealing treatment. The as-prepared samples are characterized by X-ray diffraction (XRD), Thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM) and nitrogen adsorption/desorption experiments. The electrochemical performances of NiCo2O4 are characterized by cyclic voltammetry, charge-discharge and electrochemical impedance spectroscopy tests. The results reveal that the NiCo2O4 nanorods manifest a high specific capacitance of 565 F g(-1) (1 mg cm(-2) loading) at a current density of 1 A g(-1), with superior rate capability and good cycling stability. The good electrochemical properties combined with the facile and cost-effective preparation method will render it attractive for promising application in supercapacitors. (C) 2014 Elsevier B.V. All rights reserved.