Design and synthesis of metal-organic framework based electrode materials for energy storage

Abstract

The development of supramolecular frameworks with tailored structural features remains challenging. Here, we report a novel cobalt-based functionalized layered framework (Co-MOF) synthesized via a mixed-ligand strategy using Azopyridine (AzPY) and 2,3,5,6-tetrafluoro-1,4-benzenedicarboxylic acid (TF). The framework possesses unique structural advantages, including stable hydrogen bonding, π-π stacking, and a fluorinated functionalized network. Co-MOF features a Co(O₄N₂) coordination environment with two coordinated water molecules, contributing to an extended hydrogen-bonding network. Its electrochemical performance as an electrode material for supercapacitors was evaluated. Electrochemical analysis reveals that Co-MOF exhibits a significantly higher specific capacitance of 956 F g⁻¹ at 1 A g⁻¹, along with an excellent cycling stability. Real-time device performance further confirms its enhanced energy density. These results highlight the potential of integrating electroactive building blocks with functionalized frameworks into real-world applications to achieve superior electrochemical properties. By precisely controlling ligand size, functional groups, and solvent-mediated synthesis, this strategy paves the way for the design of next-generation electrode materials for high-performance supercapacitors. Keywords: Functionalized layered framework; H-bonding; π-π stacking; supercapacitor performance; ASC device.