High‐Density Accessible Iron Single‐Atom Catalyst for Durable and Temperature‐Adaptive Laminated Zinc‐Air Batteries

Abstract Designing single‐atom catalysts (SACs) with high density of accessible sites by improving metal loading and sites utilization is a promising strategy to boost the catalytic activity, but remains challenging. Herein, a high site density (SD) iron SAC (D‐Fe‐N/C) with 11.8 wt.% Fe‐loading is reported. The in situ scanning electrochemical microscopy technique attests that the accessible active SD and site utilization of D‐Fe‐N/C reach as high as 1.01 × 10 21 site g −1 and 79.8%, respectively. Therefore, D‐Fe‐N/C demonstrates superior oxygen reduction reaction (ORR) activity in terms of a half‐wave potential of 0.918 V and turnover frequency of 0.41 e site −1 s −1 . The excellent ORR property of D‐Fe‐N/C…

• NN
  National Natural Science Foundation of China

  Awards: 52073137, 52373187, 52373187;52073137
• NS
  Natural Science Foundation of Jiangxi Province

  Award: 20224ACB204006