Fabrication of V2O5@Co-MOF as a cathode material with excellent rate capability

Abstract

In recent years, the demand for energy storage devices with high-performance has propelled intense research efforts toward the development of promising supercapacitors. Among various electrode material, vanadium pentoxide (V₂O₅) has gained significant interest due to its excellent electrochemical properties. For the application of energy storage, V₂O₅ has intrinsic low electrical conductivity and limited cycle stability, makes its practical application limited. To overcome these challenges, the integration of V₂O₅ with metal-organic framework (MOF) nanocomposites has emerged as a promising strategy. This study focuses on the synthesis, characterization, and electrochemical analysis of V₂O₅ with zeolitic imidazolate framework-67 (ZIF-67) nanocomposites for supercapacitor applications. The V₂O₅@ZIF-67 hybrid material has been prepared by a simple in-situ chemical method. The XRD pattern of V₂O₅@ZIF 67 nanocomposites illustrate the combination of V₂O₅ with ZIF 67, as well as the subsequent growth of two phases without any modification to the parent. Within a potential window of 0 to 0.45 V, the synthesised V₂O₅@ZIF-67 in the three-electrode system exhibits a high specific capacitance of 913.06 F g⁻¹ at a current density of 6 A g⁻¹. The fabricated asymmetric supercapacitor (ASC) device delivers a superior energy density of 9.69 Wh kg⁻¹ and power density of 2187.5 W kg⁻¹.