Hydrothermally synthesized microrods and microballs of NiCo2O4 for supercapacitor application

The microrods and microballs of NiCo 2 O 4 are successfully synthesized by the hydrothermal method. The effect of ammonium hydroxide and ammonium fluoride on the surface microstructure is observed. The prepared microrods and microballs of NiCo 2 O 4 are analyzed by various analytical tools like powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), with energy dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). The electrochemical properties are studied by using cyclic voltammetry (CV), galvanostatic charge discharge (GCD), and electrochemical impedance spectroscopy (EIS), using the workstation Biologic SP-200. The maximum specific capacitance of the NiCo 2 O 4 microrods electrode is 1671 F/g. The areal specific capacitance of the NiCo 2 O 4 microrods electrode is 284 mF/g. The energy density and power density of microrods of NiCo 2 O 4 electrode are 19 Wh/Kg and 282 W/kg, respectively. The equivalent series resistance (Rs) is 0.62 Ω for NiCo 2 O 4 microrods.