Sulfur Mismatch Substitution in Layered Double Hydroxides as Efficient Oxygen Electrocatalysts for Flexible Zinc–Air Batteries

• DOI: 10.1002/adfm.202212233
• Publication Date: 2023-01-02T01:59:35Z
• Authors: Xiaotong Han; Nannan Li; Jae Sung Baik; Peixun Xiong; Yingbo Kang; Qingyun Dou; Qing Liu; Jin Yong Lee; Chul Sung Kim; Ho Seok Park
• Keywords: Layered double hydroxides; Oxygen evolution

Abstract Although layered double hydroxides (LDHs) are extensively investigated for oxygen electrocatalysis, their development is hampered by limited active sites and sluggish reaction kinetics. Here, sulfur mismatch substitution of NiFe–LDH (S–LDH) demonstrated, which in‐situ deposited on nitrogen‐doped graphene (S–LDH/NG). This atomic‐level incorporation leads to the construction tailored topological microstructure modulated electronic structure improved catalytic activity durability bifunctional electrocatalysts. The combined computational experimental results clarify that electron transfer between anion Fe 3+ generates high‐valence 4+ species, while induces metallic conductivity, an increased carrier density, reduced barrier. Consequently, as‐fabricated Zn–air battery achieves a high power density 165 mW cm ‐2 , large energy 772 Wh kg Zn ‐1 at 5 mA long cycle stability 120 h, demonstrating its real‐life operation.