Defect‐Rich High‐Entropy Spinel Oxide as an Efficient and Robust Oxygen Evolution Catalyst for Seawater Electrolysis

ABSTRACT Overall seawater splitting driven by regenerable electricity is an ideal pathway for mass production of green hydrogen. Nonetheless, its anodic oxygen evolution half‐reaction (OER) confronts sluggish kinetics, competitive chlorine evolution, and chloride corrosion or poisoning problems, needing to develop high‐efficient and robust electrocatalysts toward those challenges. Herein, novel defect‐rich single‐phase (NiCoMnCrFe) 3 O 4 high‐entropy spinel oxide (HEO) is fabricated by low‐temperature annealing of high‐entropy layered double hydroxide precursor. Due to the presence of abundant defects, unique “cocktail” effect, and efficient electronic structure regulation, such (NiCoMnCrFe) 3 O 4 can deliver…

• SS
  Salt Science Research Foundation

  Award: BL14W1
• NN
  National Natural Science Foundation of China

  Awards: 21671106, 22102073, 62288102
• NU
  Nanjing University
• FN
  Fujian Normal University

  Award: Y0720316K13
• NL
  National Laboratory of Solid State Microstructures, Nanjing University
• SK
  State Key Laboratory of Coordination Chemistry
• PA
  Priority Academic Program Development of Jiangsu Higher Education Institutions