Synergistic Fe−Se Atom Pairs as Bifunctional Oxygen Electrocatalysts Boost Low‐Temperature Rechargeable Zn‐Air Battery

Abstract Herein, we successfully construct bifunctional electrocatalysts by synthesizing atomically dispersed Fe−Se atom pairs supported on N‐doped carbon (Fe−Se/NC). The obtained Fe−Se/NC shows a noteworthy bifunctional oxygen catalytic performance with a low potential difference of 0.698 V, far superior to that of reported Fe‐based single‐atom catalysts. The theoretical calculations reveal that p‐d orbital hybridization around the Fe−Se atom pairs leads to remarkably asymmetrical polarized charge distributions. Fe−Se/NC based solid‐state rechargeable Zn‐air batteries (ZABs−Fe−Se/NC) present stable charge/discharge of 200 h (1090 cycles) at 20 mA cm −2 at 25 °C, which is 6.9 times of ZABs−Pt/C+Ir/C. At…

• NN
  National Natural Science Foundation of China

  Awards: 21890383, BL11B, 22171157, 22279165
• CS
  Central South University
• SK
  State Key Laboratory of Powder Metallurgy