Study of Supercapacitive activity of Eu-MOF as an electrode material
High surface area and redox activity are indispensable characteristics for a material to be considered as an electrode material in pseudocapacitors. In this regard, redox active metals-based metal-organic frameworks (MOFs) with high surface area, can function as supercapacitors. In this research study, a hydrothermal process was applied to synthesize Eu-based metal-organic framework (Eu-MOF) [Eu2(fma)2(ox)(H2O)4.4H2O] (fma = fumarate and ox = oxalate). The supercapacitive activity of Eu-MOF was investigated by instrumental analyses of cyclic voltammetry (CV), galvanostatic charge/discharge, and electrochemical impedance spectroscopy (EIS) measurements in 6 M KOH as an electrolyte. The Eu-MOF exposed a specific capacitance of 468 F g-1 at a discharge current density of 1 A g-1, and 95.2% capacitance retention after 4000 cycles. To the best of our knowledge, this study is considered as the start point of using lanthanide-MOF as an electrode material for supercapacitors and the results obviously consent to outstanding properties of Eu-MOF for the mentioned application.