Tailoring copper content in high-entropy oxides for enhanced water oxidation catalysis (opens in new tab)

High-entropy oxides (HEOs) have recently gained considerable attention as next-generation electrocatalysts owing to their exceptional compositional flexibility, structural stability, and synergistic multimetal effects. In this study, a series of Cu-modified high-entropy oxide catalysts (HEO–Cu) with different Cu loadings (20%, 30%, 40%, 50%, and 60%) supported on nickel foam (NF) were synthesized via a facile co-precipitation method and comprehensively characterized by X-ray diffraction (XRD)...