Speakers
Description
The rapid population growth and technological advancement fuelled global energy demand. World is on race to develop an efficient, and sustainable energy storage solutions. Amongst the available technologies, supercapacitors have emerged as promising devices, bridging the gap between conventional capacitors and batteries. Supercapacitors exhibit higher energy and power densities, with long cycle life, low maintenance requirements and enhanced safety compared to conventional systems. Transition bi and tri metal oxides, owing to their multiple oxidation states, rich redox chemistry and high theoretical capacitance values have garnered much attention for development of supercapacitor electrodes.
In this research, ZnMn₂O₄, a bimetallic oxide with a spinel crystal structure, has been synthesized as the active electrode material using a facile co-precipitation method followed by thermal treatment at varying calcination temperatures. The material was thoroughly characterized using a combination of structural and electrochemical techniques, including X-ray diffraction (XRD), UV–Visible (UV–Vis) spectroscopy, Cyclic Voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS). Each technique provided insights into phase composition, crystallinity, band gap, charge storage behaviour and resistance characteristics.
The study highlights the effect of calcination temperature on the crystallite size, lattice parameters and electrochemical performance of ZnMn₂O₄. Specific capacitance is found to have maximum value of 139.87 F/g at 10 mV/s, revealing pseudocapacitive behaviour and good rate capability. The results demonstrate that ZnMn₂O₄ electrodes can significantly enhance supercapacitor performance.