Hierarchical NiCo 2 O 4 Hollow Microcuboids as Bifunctional Electrocatalysts for Overall Water‐Splitting

Abstract Bifunctional electrocatalysts for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in alkaline electrolyte may improve the efficiency of overall water splitting. Nickel cobaltite (NiCo 2 O 4 ) has been considered a promising electrode material for the OER. However, NiCo 2 O 4 that can be used as an electrocatalyst in HER has not been studied yet. Herein, we report self‐assembled hierarchical NiCo 2 O 4 hollow microcuboids for overall water splitting including both the HER and OER reactions. The NiCo 2 O 4 electrode shows excellent activity toward overall water splitting, with 10 mA cm −2 water‐splitting current reached by applying just 1.65 V and 20 mA cm −2 by applying just…

• NN
  National Natural Science Foundation of China

  Award: 21522606
• RP
  Recruitment Program of Global Experts
• FR
  Fundamental Research Funds for the Central Universities
• TY
  Thousand Young Talents Program of China
• SF
  Science Fund for Distinguished Young Scholars of Zhejiang Province