Cobalt-based metal–organic framework (Co-MOF) thin films with high capacitance for supercapacitor electrode

One of the advanced forms of energy storage is the supercapacitor, which offers many advantages including high power density and fast charging and discharging rates. Metal–organic frameworks (MOFs), which are potential supercapacitor electrode materials, have been intensively researched. In this study, we used a simple and affordable solvothermal approach to prepare Co-based MOF films on a stainless steel substrate. Different physico-chemical techniques such as XRD, FT-IR, FESEM, EDAX, and Elemental Mapping are used for the characterization of Co-MOF thin films. XRD study suggested that the Co-MOF thin film is crystalline. FESEM analysis shows nanosheet-like morphology on stainless steel substrates. The EDAX analysis confirms the composition of the Co-MOF structure. Moreover, Co-MOF is a pseudocapacitor-type material that provides good specific capacitance of 980 F g⁻¹ at current density of 1 mA cm⁻². The results of this work provide a sustainable electrode material for excellent supercapacitor performance and may open a new route toward the production of MOF materials with excellent charge storage capabilities while being cost-effective.