Facile synthesis of bimetallic metal-organic frameworks for enhanced supercapacitor performance

Official URL: https://dx.doi.org/10.1016/j.jpowsour.2025.238832

Bimetallic metal-organic frameworks (BMOFs) represent an advanced class of electrode materials for supercapacitors due to their tunable electronic properties and high surface area. This study synthesizes Fe-based BMOFs, including Fe/Ni, Fe/Co, Fe/Mn, and Fe/Cu, using the solvothermal method and conducts comprehensive characterization. Structural analysis confirms the incorporation of secondary metal ions into the framework, while Fourier Transform Infrared Spectroscopy (FT-IR) verifies ligand-metal interactions. SEM (Scanning Electron Microscope) reveals distinct morphologies, with FeNi, FeMn, and FeCo exhibiting deltoid shapes, whereas FeCu presents a rod-like structure. Surface area measurements indicate that FeMn BMOF achieves the highest value of 434.17 m2/g, contributing to its superior electrochemical performance. Electrochemical measurements demonstrate that FeMn BMOF exhibits a high specific capacitance of 186.5 F/g, attributed to its large surface area and efficient ion diffusion. Impedance analysis reveals its low charge transfer resistance, confirming high conductivity. Stability tests indicate that FeMn BMOF maintains excellent coulombic efficiency over 1000 cycles. These findings highlight the potential of FeMn BMOF as a promising electrode material for next-generation supercapacitor technologies.