Layered AI-substituted Cobalt Hydroxides/GO Composites for Electrode Materials of Supercapacitors

In this work, Al-substituted a-Co（OH）2/GO composites with supercapacitive properties were prepared by chemical co-precipitated method in which cobalt nitrate and aluminum nitrate were used as the raw material, and graphite oxide was employed as carrier. The as-prepared materials were characterized by X-ray diffraction （XRD）, field emission scanning electron microscopy （FESEM） and fourier transform infrared spectroscopy （FF-IR）. Cyclic voltammetry （CV） and galvanostatic charge/discharge measurements showed that the Al-substituted a-Co（OH）2/GO electrode material had excellent electrochemical capacitance. The specific capacitance of 1137 F·g-11 was achieved in 6 mol/L KOH solution at a current density of 1 A·g-1 within a potential range of 0-0.5 V. Moreover, only 12% losses of the initial specific capacitance were found after 500 cycles at a current density of 1 A·g-1.