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.