Triggering Oxygen Redox Cycles in Nickel Ferrite by Octahedral Geometry Engineering for Enhancing Oxygen Evolution.

ABSTRACT: Spinel-type nickel ferrite (Ni_xFe_3-xO₄, x≤1) is a widely used electrocatalyst for the oxygen evolution reaction (OER). Due to the lower hybridization of metal-d and oxygen-p orbitals, the OER process on Ni_xFe_3-xO₄ follows the sluggish adsorbate evolution mechanism (AEM). Generally, activating the lattice oxygen to trigger the lattice-oxygen-mediated mechanism (LOM) can enhance the OER activity. Herein, to trigger the LOM pathway while maintaining high stability, iron foam (IF)-supported Ni_0.75Fe_2.25O₄ (NiFeO) with geometrical defects of [NiO₆] (nickel cation coordinated with six oxygen anions) units and higher ratio of Fe to Ni cations in octahedral sites (d-NiFe^HRO/IF)

SUBMITTER: Peng Y 

PROVIDER: S-EPMC11792042 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature