Dual Single‐Atomic Ni‐N 4 and Fe‐N 4 Sites Constructing Janus Hollow Graphene for Selective Oxygen Electrocatalysis

Abstract Nitrogen‐coordinated metal single atoms in carbon have aroused extensive interest recently and have been growing as an active research frontier in a wide range of key renewable energy reactions and devices. Herein, a step‐by‐step self‐assembly strategy is developed to allocate nickel (Ni) and iron (Fe) single atoms respectively on the inner and outer walls of graphene hollow nanospheres (GHSs), realizing separate‐sided different single‐atom functionalization of hollow graphene. The Ni or Fe single atom is demonstrated to be coordinated with four N atoms via the formation of a Ni‐N 4 or Fe‐N 4 planar configuration. The developed Ni‐N 4 /GHSs/Fe‐N 4 Janus material exhibits excellent bifunctional…

• NN
  National Natural Science Foundation of China

  Awards: 21902078, 21875112
• AR
  Australian Research Council