Facile synthesis and asymmetric device fabrication of zeolite like Co-MOF as a promising electrode material with improved cyclic stability

A huge surface area, tuneable pore size and topologies, and variable periodic metal ions-imidazolate are some of the more evident advantages. Zeolitic imidazolate frameworks (ZIFs) have been identified as resourceful atoning templates for the production of functional materials and as modern electrodes for advanced storage systems. In this present investigation, we demonstrate the cobalt and 2-methylimidazole-connected hybrid framework, Zeolitic imidazolate framework- 67 (ZIF-67) nanocrystals (NCs) for electrochemical application. ZIF-67 NCs have been synthesized at room temperature by a facile and one-pot method. As-synthesized ZIF-67 NCs have been investigated by various analytical techniques. FT-IR has been employed to validate the existence of free Co and imidazolate bonds in ZIF-67 NCs. The SEM-EDS analyses exhibited uniform aggregated hexagonal-shaped nanoparticles and the composition of the elements. ZIF-67 exhibits uniform rhombic dodecahedron morphology, with a particle size of roughly 100 nm. These ZIF-67 NCs have been exploited as the functioning metal-based electrode in electrochemical studies, which demonstrate exceptional long-term stability with 84.98% of their discharge specific capacitance maintaining after 6000 cycles at a current density of 14 A g −1 in a three-electrode system and a specific capacitance value of 1068.62 F g −1 at the current density of 4 A g −1 . In addition, the assembled asymmetric supercapacitor conveys a huge energy density of 17.47 Wh kg −1 and a power density of 1805.55 W kg −1 . The capacitance retention rate of ZIF-67//AC material is still retaining 66.39% after 10,000 cycles, showing excellent cycle stability.