Zinc Single‐Atom Catalysts Encapsulated in Hierarchical Porous Bio‐Carbon Synergistically Enhances Fast Iodine Conversion and Efficient Polyiodide Confinement for Zn‐I 2 Batteries

Abstract Aqueous zinc iodine (Zn‐I 2 ) batteries have attracted attention due to their low cost, environmental compatibility, and high specific capacity. However, their development is hindered by the severe shuttle effect of polyiodides and the slow redox conversion kinetics of the iodine (I 2 ) cathode. Herein, a long‐life Zn‐I 2 battery is developed by anchoring iodine within an edible fungus slag‐derived carbon matrix encapsulated with Zn single‐atom catalysts (SAZn@C FS ). The high N content and microporous structure of SAZn@C FS provide a strong iodine confinement, while the Zn‐N 4 ‐C sites chemical interact with polyiodides effectively mitigating the iodine dissolution and the polyiodide shuttle effect.…

• NN
  National Natural Science Foundation of China

  Awards: 52272208, U23A20684, 22122902
• NS
  Natural Science Foundation of Hubei Province

  Award: 2023AFB845