UiO‐66‐NH ₂ /MWCNT Binary Hybrid Composites for High Performance Aqueous Symmetric Supercapacitor Applications

Metal–organic framework (MOF)‐based composites integrated with carbon nanomaterials have garnered significant interest for supercapacitor electrode applications due to their tunable porosity and enhanced conductivity. In this study, a UiO‐66‐NH ₂ /MWCNT composite was prepared via a facile one‐step solvothermal method and investigated as a supercapacitor electrode material for the first time. Comprehensive structural and morphological characterizations, including XRD, FT‐IR, Raman, XPS, SEM, and TEM, confirmed the successful formation and uniform growth of MOF nanoparticles on the backbone of MWCNTs. The composite exhibited a large specific surface area of 456.48 m ² g ⁻¹ , contributing to its excellent electrochemical performance. In a three‐electrode setup using 2 M KOH electrolyte, the hybrid produced a specific capacitance of 353.3 F g ⁻¹ at a specific current of 1 A g ⁻¹ . Furthermore, when configured as an aqueous symmetric supercapacitor device, the electrode material achieved a specific capacitance of 163.3 F g ⁻¹ , a specific energy of 32.7 Wh kg ⁻¹ at a specific power of 1.2 kW kg ⁻¹ , and demonstrated remarkable cycling stability with 82.5% capacitance retention over 3,000 cycles. These results affirm the potential of the UiO‐66‐NH ₂ /MWCNT composite as a promising electrode material for advanced energy storage devices.