High Electrochemical Performance and Photocatalytic Activity in Multicomponent Nanostructured (CuZnNiCoMg)O

High-entropy oxides (HEOs) have garnered significant attention as promising materials for sustainable energy applications due to their unique structural features, flexible chemical compositions, and tunable physicochemical and functional properties. This study explores the potential of (CuZnNiCoMg)O HEO for use in electrochemical and photocatalytic properties. Also, this study examines the role of magnesium (Mg) in enhancing the properties of (CuZnNiCo)O HEO. The (CuZnNiCo)O has formed a cubic rocksalt structure after calcination at 1473 K, while (CuZnNiCoMg)O achieved the same phase at a significantly lower temperature of 1173 K. The specific capacitance (C_s) values measured for the (CuZnNiCoMg)O and (CuZnNiCo)O electrodes were 276.69 and 257.88 Fg^-1, respectively, in 1 M KOH at a scan rate of 1 mVs^-1. Additionally, both compositions were employed as photocatalysts for the dye degradation of methylene blue (MB). The (CuZnNiCoMg)O photocatalyst achieved 81.14% degradation efficiency in one h, significantly outperforming the 64.16% efficiency achieved by the (CuZnNiCo)O photocatalyst under similar conditions. These findings underscore the superior multifunctional performance of (CuZnNiCoMg)O, highlighting its potential for energy storage and environmental remediation applications.