Abstract
Increasing demand for energy is a significant challenge to achieve sustainable development. The advancement of energy storage device depends on the discovery of novel materials for which high entropy materials are promising candidates and have shown extraordinary electrochemical properties. This study reports the synthesis of novel high entropy oxide (HEO), (Mg0.21Cr0.21Mn0.21Fe0.21Cu0.16)3O4, using sol-gel method followed by calcination at high temperatures. Microscopic images show a homogeneous particle size distribution of 250-500 nm. The structural analysis underscores the importance of optimal stoichiometry for the formation of high-performance single-phase spinel-structured HEO. The XRD and electrochemical analysis emphasize the role of multiple elements in phase stabilization and the elements contribution to the electrochemical performance of the HEO. The oxidation and reduction behaviour of HEO with KOH electrolyte is found to be in the desired potential range of 0 V-0.4 V. The material shows the pseudocapacitive nature with an enhanced specific capacitance of 241 Fg⁻1 at 1 Ag⁻1 and retains 86% of its capacitance even after 2000 cycles, indicating excellent electrochemical stability and performance. This work highlights the potential of high entropy oxides as an advanced material for energy storage applications, offering enhanced stability and performance in supercapacitors.
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