Self-supporting Co₃O₄/NiFe₂O₄ nanoflowers for efficient oxygen evolution reaction

The construction of high-quality oxygen evolution reaction (OER) catalysts is crucial for the widespread application of hydrogen production technology. Herein, a Co₃O₄/NiFe₂O₄ nanoflower electrocatalyst with an enhanced metal synergistic effect is reported. The unique nanoflower structure endows the catalyst with fast mass transfer kinetics. The introduction of Co₃O₄ not only enhances the multi-metal synergistic effect in NiFe₂O₄, optimizing the adsorption of oxygen-containing intermediates, but also improves the conductivity of the material, facilitating interfacial charge transfer. Accordingly, the Co₃O₄/NiFe₂O₄ material exhibits extraordinary OER activity (<i>η</i>₁₀ = 236 mV) and stability. Surprisingly, the Co₃O₄/NiFe₂O₄//Pt/C electrode still demonstrates remarkable performance (<i>E</i>₁₀ = 1.54 V) during overall water splitting (OWS) testing. This outstanding electrochemical performance of the Co₃O₄/NiFe₂O₄ electrocatalyst lays a solid foundation for its potential commercial application.