Enhancing the electrochemical performance of hybrid supercapacitors with in-situ grown ultrasound-mediated heterostructure bi-metallic and dual-linker MOF nanoarchitecture by harnessing charge storage mechanisms

Abstract

In the present technological era, energy storage devices like batteries and supercapacitors hold immense importance, and their hybrid variants have gained notable interest. The aim of this study was to develop a dual-linker MOF capable of selectively capturing cobalt and vanadium ions using two distinct organic ligands. The ultrasonication-assisted hydrothermal technique was demonstrated to be a resounding success in achieving the synthesis of the bimetallic and dual-linker metal-organic framework (MOF). The outcome of the electrochemical analysis demonstrated that the Co-V-capacitance MOF contributes to the battery-type process by diffusion control at 88.52 %, while 11.48 % of the process is capacitive-controlled, in an aqueous electrolyte (1 M KOH). Additionally, the upgraded Co-V-MOF electrode displayed an impressive specific capacity of 1711.1 F/g. The utilization of Co-V-MOF in the hybrid Asymmetric supercapacitor resulted in an outstanding specific capacitance of 187.5 F/g, with energy and power densities of 70.65 Wh/kg and 835 W/kg, respectively. It is important to mention that the Co-V-MOF hybrid supercapacitor exhibited excellent and consistent performance for 10,000 cycles (92.21 %). The outstanding specific capacitance performances produced in this study represent the most significant findings reported to date for bi-metallic and dual-linker MOFs based on vanadium-cobalt.