Solvothermal synthesis of binder free Ni-MOF thin films for supercapacitor electrodes

To meet the energy demands of many sectors, energy storage systems must have high capacity, long cycling life, excellent energy density, and fast charge discharge rates. Because of their higher power and energy densities compared to other energy storage technologies, supercapacitors have been extensively researched in recent years. In this study, we synthesized binder-free thin films of the Nickel-Metal Organic Frameworks (Ni-MOFs) deposited on stainless steel substrate by using a simple solvothermal method. The Ni-MOF electrodes were systematically studied for their structural, morphological, and electrochemical characterizations. The microstructure of Ni-MOF electrodes varies with reaction concentration (from 0.1 mM to 0.4 mM) at the constant reaction temperature. X-ray diffraction (XRD) study reveals a crystallite phase of Ni-MOF material with a P-1 space group. The FESEM analysis shows a nanosheet-like structure of Ni-MOF material. The Ni-MOF electrode (0.3 mmol concentration) shows the specific capacitance of 850.42 F/g at a current density 1 mA/cm2 with a maximum energy density of 18.66 Wh/kg and power density of 1671 W/kg. These excellent electrochemical results demonstrate the potential of Ni-MOF for supercapacitor applications and provide directions for the development of future high-performance supercapacitor materials.