Electrochemical Stability and Superior Capacitance of Bismuth Cobalt Metal-Organic Framework Incorporated with Vanadium Disulfide Nanosheet for Supercapacitor Application

Abstract

The development of a novel supercapacitor electrode material consisting of bismuth and cobalt-based metal-organic framework (MOF) intercalated on vanadium disulfide (VS2) nanosheets (BiCo-MOF@VS2). The composite combines the high porosity and tunable functionality of MOFs with excellent conductivity and high theoretical capacitance of VS2. The MOF structure is designed to incorporate bismuth and cobalt, which enhance electrochemical performance. The VS2 nanosheets provide a conductive support matrix for the MOF, facilitating electron transport and promoting fast charge-discharge rates. Researchers used a suite of techniques to characterize the fabricated electrodes to understand the relationship between material properties and performance. These techniques analyzed the morphology, crystal structure, and electrochemical properties of the materials. The electrochemical performance of BiCo-MOF@VS2 electrodes for supercapacitor applications is investigated using cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy. The research shows that these composite electrodes are highly promising for use in supercapacitors needing top performance. They deliver impressive capacitance, handle rapid charge and discharge cycles well, and maintain stability over time. We found that the electrochemical behavior is optimum when BiCo-MOF@VS2 is used, which is a result of the synergistic effects of VS2 dispersion and the BiCo-MOF. BiCo-MOF and VS2 have shown specific capacitance values of 282 and 199Fg-1, compared to the two electrode materials, BiCo-MOF@VS2 demonstrated an impressive specific capacitance of 472Fg-1 at 1Ag-1, and cyclic stability with 85% retention even after 3000 cycles at 9Ag-1 current density tested in 1M KOH solution. This novel material holds promise for developing next-generation supercapacitors with exceptional energy storage capabilities.