Abstract
Different nanostructured mixed transition-metal oxides were synthesized using a facile and controllable hydrothermal method. Incorporation of Cu2+ and Ni2+ in Co3O4 structure led to an interesting morphological transformation, from quasi-spherical nanoparticles to microspherical urchin-like aggregates of radially assembled nanoneedles. These oxides have notable low crystallite size, narrow size distribution, and high degree of crystallinity. In general, partial cobalt substitution resulted in an improved electrocatalytic activity for oxygen evolution reaction (OER), with NiCo2O4 demonstrating superior performance among the catalysts prepared. It recorded a low overpotential of 374 mV and achieved high stability, making it competitive with state-of-the-art RuO2 and IrO2 (387 mV). This material is of great potential for sustainable energy applications.
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