Structural and electrochemical insights into bismuth-based metal organic framework for capacitive applications

The growing need for efficient energy storage has revealed key limitations in conventional battery-type electrodes, particularly their low electrical conductivity and limited cycling stability. To address this issue, a Bi-1,4-benzenedicarboxylate (Bi-OF) metal organic framework was synthesized in the form of nanosheets using a simple solvothermal method. The structure of Bi-OF was examined using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The Bi-OF material was used to modify the glassy carbon electrode (GCE), and its electrochemical performance was systematically evaluated. Its electrochemical behavior was evaluated through cyclic voltammetry (CV), charge-discharge (CD) testing, and electrochemical impedance spectroscopy (EIS). The Bi-OF electrode achieved a high specific capacitance of 1797.88 C·g⁻¹ (1284.2 F·g⁻¹) at 2.0 A·g−1. It also showed low internal resistance (110 Ω) and maintained 84.7% of its initial capacitance after 3000 cycles. These results suggest that Bi-OF is a promising candidate for high-performance and environmentally friendly supercapacitor applications.