Synthesis and Investigation of Electrochemical Studies on Thulium Tellurite (TmTeO3) for Supercapacitor Electrode Application.

Thulium tellurite ( TmTeO 3 ) is synthesized by hydrothermal method. It exhibits nearly cuboid-shaped particles along with triangular particles. TmTeO 3 is found to be monoclinic. The energy gap is 5.87 eV, the Urbach energy value is 0.287 eV and the refractive index is 1.881. The size of the particle is determined as 107 nm. Optical transitions between energy levels assign absorption and emission peaks. Tm, was found in the oxide matrix as Tellurite. Magnetic susceptibility between 20 K and 300 K decreases with temperature, reaches saturation and aligns all Thulium spins. M–H curve confirms paramagnetic nature at 300 K and feeble ferromagnetic nature at 77 K. Cyclic voltammogram and chronopotentiometry analysis exhibit pseudo-capacitive behavior. The potential window is 0.82. Specific capacitance is found to be 87 F/g. Chronopotentiometry analysis shows 55 F/g specific capacitance. Impedance analysis shows a pseudo-capacitive nature. TmTeO 3 symmetrical supercapacitor device is fabricated with potential window of 1.52 V. A specific capacitance of 37.75 F/g at 1 A/g, energy density 6.055 Wh kg − 1 and power density 760.99 W kg − 1 was achieved. Impedance analysis shows low series resistance of 2.567 Ω and charge transfer resistance of 0.473 Ω. Cyclic performance with 80% specific capacitance retention is observed after 5000 cycles. The TmTeO 3 symmetric supercapacitor electrodes possess good electrochemical properties due to wider potential window, long cycle stability and notable energy density. Thulium tellurite ( TmTeO 3 ) was synthesized by hydrothermal method. It exhibited nearly cuboid-shaped particles of size 107 nm and found to be monoclinic. Tm was present in the oxide matrix of the samples. It also exhibited feeble ferromagnetic nature at 77 K. It exhibited pseudo-capacitive behavior with potential window at 0.82. The specific capacitance was 87F/g. Energy density was 19 Wh kg–1, and a high power density of 410 W kg–1. [ABSTRACT FROM AUTHOR]