A sol-gel process for the synthesis of NiCo2O4 having improved specific capacitance and cycle stability for electrochemical capacitors
Walsh, Frank C.
Journal of The Electrochemical Society
Copyright © 2012 The Electrochemical Society
High performance nickel cobaltite (NiCo2O4) with ultrahigh capacitance is synthesized by a facile sol-gel process and then calcined at 300◦C. The structure and morphology is characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), and nitrogen adsorption/desorption experiments.Amesoporous structure with high specific surface area is obtained. Electrochemical properties are investigated by cyclic voltammetry (CV), galvanostatic charge/discharge, and electrochemical impedance spectroscopy (EIS). The NiCo2O4 exhibits excellent electrochemical performance. The highest specific capacitance of 1128 F g−1 is achieved at a current density of 5 mA cm−2 and 92.5% of the initial specific capacitance remained after 1000 cycles. NiCo2O4 prepared by this scale-able route could be a promising electrode material for electrochemical capacitors.
National Natural Science Foundation of China
Key Project of Chinese Ministry of Education
Natural Science Funds for Distinguished Young Scholars of Gansu Province
Vol. 159, Iss.8, A1262 - A1266