ZIF-67 derivatives of NiCo2S4 Decorated in Salen-Complex Amine Functionalization GO Layers for High-Performance Applications in Supercapacitor Devices

Abstract

The study develops polyamine-functionalized graphene oxide–supported NiCo₂S₄ nanomaterial using a metal–organic framework (MOF). This modification adds free amines and oxygen functionality to the graphene oxide electrode surface, resulting in the decrease in the 2 theta value from 11.2 to 7.1 and an increase in the interlayer spacing value from 1.4 to 7.8 nm. This modification enhances the surface properties, leading to improved wettability and dispersion stability. Additionally, bimetallic nanoparticles of NiCo₂S₄, synthesized via the ZIF-67 MOF template, further enhance performance. Analysis confirms the successful fabrication of ZIF-67/f-GO/NiCo₂S₄ electrode material through various techniques such as XPS spectra, FE-SEM, XRD, and Raman spectra. The resulting Salen-fGO@NiCo₂S₄ composite exhibits impressive specific capacitance, reaching 2581.65 F g⁻¹ at 10 A g⁻¹ with 82% capacity retention after 5000 cycles. Employing this composite in a hybrid supercapacitor yields remarkable energy and power densities of 40 and 920 W kg⁻¹, individually, while maintaining 74% capacity retention rate at 10 A g⁻¹. These findings offer promising prospects for advanced energy storage applications.