Spinel nickel ferrite nanoparticles strongly cross-linked with multiwalled carbon nanotubes as a bi-efficient electrocatalyst for oxygen reduction and oxygen evolution

NiFe₂O₄ nanoparticles successfully cross-linked with the outer walls of MWCNTs demonstrate excellent catalytic activities and stabilities for both the ORR and OER compared to commercial Pt/C, owing to the strong coupling and synergistic effects.