Reconstructing 1D Fe Single‐atom Catalytic Structure on 2D Graphene Film for High‐Efficiency Oxygen Reduction Reaction
Guangqi Zhu, Yanling Qi, Fan Liu, Shenqian Ma, Guolei Xiang, Fengmin Jin, Zigeng Liu, Wei Wang
Abstract
Abstract The ordinary intrinsic activity and disordered distribution of metal sites in zero/one‐dimensional (0D/1D) single‐atom catalysts (SACs) lead to inferior catalytic efficiency and short‐term endurance in the oxygen reduction reaction (ORR), which restricts the large‐scale application of hydrogen−oxygen fuel cells and metal−air batteries. To improve the activity of SACs, a mild synthesis method was chosen to conjugate 1D Fe SACs with 2D graphene film (Fe SAC@G) that realized a composite structure with well‐ordered atomic‐Fe coordination configuration. The product exhibits outstanding ORR electrocatalytic efficiency and stability in 0.1 M KOH aqueous solution. DFT‐D computational results manifest the intrinsic ORR activity of Fe SAC@G originated from the newly‐formed FeN 4 −O−FeN 4 bridge structure with moderate adsorption ability towards ORR intermediates. These findings provide new ways for designing SACs with high activity and long‐term stability.