One-Pot Synthesis of rGO@Cu₂V₂O₇ Nanocomposite as High Stabled Electrode for Symmetric Electrochemical Capacitors

Abstract

rGO anchored copper vanadate nanostructures have been synthesized through facile hydrothermal synthesis for high efficiency energy storage applications. The prepared Cu2V2O7 and rGO@Cu2V2O7 nanostructures were fabricated as the electrode materials for three electrode and symmetrical type electrochemical supercapacitors. Based on the electrochemical analysis the electrodes show outstanding areal capacitance values of 340 and 545 F/g for Cu2V2O7 and rGO@Cu2V2O7 electrodes, respectively. Also the charge discharge curves of the rGO@Cu2V2O7 electrode revealed higher specific capacitance values of 520 F/g-1 at 1 A/g-1, which is higher than that for Cu2V2O7 electrode (318 F/g-1 at 1 A/g-1). Based on the cyclic performance, the rGO@Cu2V2O7 electrode shows 98.6% withstand even at the 1000th cycle. The symmetrical electrode based device shows a higher capacitance values of 190 F/g at 1 A/g for rGO@Cu2V2O7, which is higher than that for pure Cu2V2O7 (148 F/g at 1 A/g). The synergitic reaction of rGO@Cu2V2O7 electrode shows higher energy (29.7Wh kg-1) and power (4.8 kW kg-1) than the Cu2V2O7 and rGO@Cu2V2O7 electrodes. Also, the rGO@Cu2V2O7 symmetrical electrode device shows a higher cyclic efficiency about 97.5% at the 2000th cycle. These findings sugest that the rGO@Cu2V2O7 electrode is a promising candidate for energy storage application.