Self-supported nickel iron oxide nanospindles with high hydrophilicity for efficient oxygen evolution

Abstract

Engineering nanoarray structures with favorable hydrophilicity is proposed to unlock the electrocatalysis of NiFe₂O₄ for the oxygen evolution reaction (OER). The resulting electrode, consisting of NiFe₂O₄ nanospindles directly grown on FeNi₃ foam, features enlarged active surface area, high hydrophilicity and increased electronic conductivity, which achieves superior OER activity and remarkable durability.