Importing Atomic Rare‐Earth Sites to Activate Lattice Oxygen of Spinel Oxides for Electrocatalytic Oxygen Evolution

Abstract Spinel oxides have emerged as highly active catalysts for the oxygen evolution reaction (OER). Owing to covalency competition, the OER process on spinel oxides often follows an arduous adsorbate evolution mechanism (AEM) pathway. Herein, we propose a novel rare‐earth sites substitution strategy to tune the lattice oxygen redox of spinel oxides and bypass the AEM scaling relationship limitation. Taking NiCo 2 O 4 as a model, the incorporation of Ce into the octahedral site induces the formation of Ce−O−M (M=Ni, Co) bridge, which triggers charge redistribution within NiCo 2 O 4 . The developed Ce−NiCo 2 O 4 exhibits remarkable OER activity with a low overpotential, satisfactory electrochemical…

• NN
  National Natural Science Foundation of China

  Awards: 22379071, 22232004, 22109073
• NS
  Natural Science Foundation of Jiangsu Province

  Award: BK20221321