Facile synthesis of rGO nanosheet encapsulated Ni2V2O7 nanorods for energy storage applications

Abstract

The less emission, environmental friendliness and less hazardous energy storage materials are most impotent to the clean energy system. Here we synthesis rGO anchored nickel vanadate nanorods for supercapacitor application. As a result, the Ni2V2O7 and rGO@Ni2V2O7 nanomaterials show a monoclinic structure from the XRD pattern. The vibrational of V–O–V and Ni–O along with the main peak of carbon materials indicates the rGO anchoring with Ni2V2O7 in the FTIR and Raman spectra. The SEM and TEM images illustrate a rod shaped Ni2V2O7 was attached over the rGO sheet surface. From the BET analysis, the rGO@Ni2V2O7 sample has a higher surface area than the Ni2V2O7 electrode. Further, the supercapacitor application of Ni2V2O7 and rGO@Ni2V2O7 electrodes shows 318 F/g and 624 F/g at 1 A/g capacitance values. Although, the rGO@Ni2V2O7 electrode shows higher power (771 W/kg) and energy density (22.28 Wh/kg) values than the NiV2O7 electrode. Moreover, the rGO@Ni2V2O7 exhibits a 95% of capacitance retention value even at the 1000th cycle. Moreover, the prepared rGO@Ni2V2O7 has less Rct value of 4.72 Ω) than the Ni2V2O7 electrode (9.86 Ω). The attachment of rGO can provide a higher surface area, higher conductivity and lower resistivity to the Ni2V2O7 electrode. According to these results, the rGO@Ni2V2O7 electrode is the more suitable for supercapacitor electrodes.