Construction of Well-Defined Two-Dimensional Architectures of Trimetallic Metal-Organic Frameworks for High-Performance Symmetric Supercapacitors

Thehigh surface-to-volume ratio and extraordinarilylarge-surfacearea of two-dimensional (2D) metal-organic framework (MOF)architectures have drawn particular interest for use in supercapacitors.To achieve an excellent electrode material for supercapacitors, well-defined2D nanostructures of novel trimetallic MOFs were developed for supercapacitorapplications. Multivariate MOFs (terephthalate and trimesate MOF)with distinctive nanobrick and nanoplate-like structures were successfullysynthesized using a straightforward one-step reflux condensation methodby combining Ni, Co, and Zn metal species in equimolar ratios withtwo different ligands. Furthermore, the effects of the tricarboxylicand dicarboxylic ligands on cyclic voltammetry, charge-dischargecycling, and electrochemical impedance spectroscopy were studied.The derived terephthalate and trimesate MOFs are supported with stainless-steelmesh and provide a suitable electrolyte environment for rapid faradaicreactions with an elevated specific capacity, excellent rate capability,and exceptional cycling stability. It shows a specific capacitanceof 582.8 F g(-1), a good energy density of 40.47 Wh kg(-1), and a power density of 687.5 W kg(-1) at 5 mA cm(-2) with an excellent cyclic stabilityof 92.44% for 3000 charge-discharge cycles. A symmetric BDC-MOF//BDC-MOFsupercapacitor device shows a specific capacitance of 95.22 F g(-1) with low capacitance decay, high energy, and powerdensities which is used for electronic applications. These brand-newtrimetallic MOFs display outstanding electrochemical performance andprovide a novel strategy for systematically developing high-efficiencyenergy storage systems.