Investigating the influence of copper benzene-1,2-dicarboxylate (Cu-BDC) and benzene-1,3,5-tricarboxylate ligands (Cu-BTC) on the electrochemical capacity of hybrid supercapacitors

The elevated energy demand and crises have rooted the urge to develop advanced electrode materials that can overcome the energy dilemma present all over the globe. Metal-organic frameworks (MOFs) have emerged as promising electrode materials in recent times due to their better electrochemical properties. Herein the metal ligand synergy produced in MOFs is observed for the same metal center (Cu) with different ligands i.e., benzene-1,3,5-tricarboxylate (1,3,5-BTC) and benzene-1,2-dicarboxylate (1,2-BDC). The hybrid device of the best performing MOF (Cu-1,3,5-BTC//AC) reveals the energy and power density of 88.32 Wh kg⁻¹ and 680 W kg⁻¹, respectively. Even at the highest current density of 15 A/g, the device retained the E_s of 21.25 Wh kg⁻¹ and P_s of 12,750 W kg⁻¹. Furthermore, the semi-empirical approach was utilized for the evaluation of capacitive and diffusive contributions.