Designing a zinc-calcium selenite nanocomposite: unmasking structural, morphological, optical, magnetic and electrochemical characteristics with enhanced supercapacitor performance

The hydrothermal method is used to create a zinc-calcium selenite (ZnSeO₃/CaSeO₃) nanocomposite. It displays nanorods that resemble capsules. The refractive index, energy gap, particle size, and Urbach energy is 1.972, 5.191 eV, 109.4 nm, and 0.621 eV, respectively. The sample shows interesting UV filtering and optoelectronic properties. It is a material with potential for display technologies because spectroscopic research has revealed native and surface point defects that promote radiative electron-hole recombination. The distinctive bands Zn-O, Se-O, and Zn-Se are revealed by infrared spectroscopy. At 300 K, the sample shows modest ferromagnetic behaviour. A thermal study demonstrates the material's behavior, thermal stability, and decomposition at different temperatures. XPS guarantees the orbital state of an element with spin-orbit coupling (j) and validates the chemical state. With a potential window of 1 V and a specific capacitance of 862.81 F g^-1, electrochemical analysis shows pseudo-capacitive activity.