In this work, effects of drying temperature, pH of aqueous electrolyte and current density on capacitive performance of VOx·nH2O material were firstly investigated. VOx·nH2O powders were prepared by a melt quenching method. The samples were characterized by X-ray diffraction analysis (XRD) and Fourier transform infrared (FTIR). The capacitive properties of VOx·nH2O samples were examined by cyclic voltammetry and galvanostatic charge/discharge test. VOx·nH2O sample which was obtained at the drying temperature of 80 °C, delivers a maximum specific capacitance of 227.3 F g−1 and exhibits excellent capacity retention in the potential range of −0.3 to 0.7 V at a current density of 200 mA g−1 in NaNO3 solution with pH 2.