Advancing energy storage and supercapacitor applications through the development of Li-doped MgTiO perovskite nano-ceramics.

Perovskite oxide materials, specifically MgTiO (MT) and Li-doped MgTiO (MTxLi), were synthesized via a sol-gel method and calcination at 800 °C. This study explores the impact of varying Li doping levels (x = 0, 0.01, 0.05, and 0.1) on the crystalline structure and properties of MgTiO. X-ray diffraction analysis revealed a well-defined rhombohedral MgTiO phase. Optical diffuse reflectance measurements provided insights into energy gap values, refractive index, and dielectric constant. Li doping enhanced the electrical properties of MgTiO, with a notable phase transition observed at 50 °C. The study investigated impedance and AC conductivity under varying temperature and frequency conditions (25-120 °C, 4 Hz to 8 MHz). Electrochemical analysis through cyclic voltammetry and electrochemical impedance spectroscopy confirmed highly electrocatalytic properties for MTxLi, particularly when modified onto screen-printed electrodes. This work not only advances the understanding of Li-doped MgTiO nanostructures but also highlights their significant potential for direct electrochemical applications, particularly in the realm of energy storage.