Nano-architectured BaO thin film electrode synthesized via SILAR technique for supercapacitor application

A promising thin film electrode material of barium oxide (BaO) for supercapacitors had been prepared by successive ionic layer adsorption and reaction (SILAR) technique. Several analytical tools such as X-ray diffractometer, field emission scanning electron microscopy (FE-SEM), and transmission electron microscopy (TEM) were used to characterize the barium oxide. The electrochemical properties of created thin films were elucidated by cyclic voltammetry (CV), chronopotentiometry (CP) measurements, and electrochemical impedance spectroscopy (EIS). This material showed excellent cycling capability; it retains 91.1% capacitance retention after 7500 cycles. The maximum value of a specific capacitance (Cs) was 405.72 F/g at a 5 mV/s scan rate in 1 M KOH electrolyte. The obtained maximum values of energy density and power density were 53.57 Wh/kg and 2390 W/kg at 4 mA/cm² in 1 M KOH, respectively. The internal resistance of the BaO thin film was ~ 0.83 Ω. These outcomes designate the high-rate capability performances of BaO electrodes, and it can be accepted as high-performance thin film electrode material.