Nickel Metal-Organic Framework-Based Surfaces for Effective Supercapacitor Application

Abstract

Abstract Metal–organic frameworks (MOFs), characterized by strong bonds between organic ligands and metal ions, exhibit high porosity, large surface area, and exceptional chemical stability when carefully designed. In this study, a novel MOF comprising lead ions and ligands derived from 2-carboxybenzaldehyde and 4-aminobenzoic acid was synthesized using a sonochemical approach. This innovative method enabled the rapid formation of highly porous crystals with a BET surface area of 1181.45 m 2 g 1 and a total pore volume of 2.27 cm 3 g −1 at P/P₀ = 0.3023. Comprehensive characterization techniques, including thermal analysis, SEM, EDX, PXRD, and FT-IR, confirmed the successful formation of the MOF structure. The synthesized MOF was utilized to fabricate an enhanced Ni-MOF electrode, demonstrating superior electrochemical performance for capacitor applications. The electrode achieved a specific capacitance of 402 F g −1 at 1 mA cm −2 and maintained excellent cycling stability, with 87.9% capacitance retention over 4000 cycles at 5 A g −1 . These results underline the potential of the synthesized MOF in advancing energy storage technologies, particularly in developing high-performance and durable electrochemical capacitors.