Rechargeable Zn-Air Batteries with Outstanding Cycling Stability Enabled by Ultrafine FeNi Nanoparticles-Encapsulated N-Doped Carbon Nanosheets as a Bifunctional Electrocatalyst

Xufeng Li, Yijiang Liu, Hongbiao Chen, Mei Yang, Duanguang Yang, Huaming Li, Zhiqun Lin

Research output: Contribution to journalArticlepeer-review

93 Scopus citations

Abstract

Despite grand advances in Zn-air batteries in recently years, their commercialization remains challenging due largely to the lack of efficient bifunctional oxygen catalysts. Herein, we report the crafting of a bifunctional electrocatalyst comprising ultrafine alloyed FeNi nanoparticles encapsulated within N-doped layered carbon nanosheets (denoted FeNi/N-LCN) for high-efficiency Zn-air batteries. The FeNi/N-LCN electrocatalyst is yielded via the coordination of triphenylimidazole-containing polyaniline (TPANI) oligomer with Fe- and Ni-containing precursors, followed by hydrogen binding with melamine and subsequent pyrolysis. The as-constructed FeNi/N-LCN manifests outstanding activity and stability toward both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The primary Zn-air battery assembled with FeNi/N-LCN delivers both high specific capacity and peak power density. Remarkably, the rechargeable Zn-air battery can be repeatedly charged and discharged for 1100 h at 5 mA cm-2 and for 600 h at 10 mA cm-2, representing the highest cycling stability among various reported Zn-air batteries.

Original languageEnglish
Pages (from-to)3098-3105
Number of pages8
JournalNano Letters
Volume21
Issue number7
DOIs
StatePublished - 14 Apr 2021

Bibliographical note

Publisher Copyright:
© 2021 American Chemical Society.

Keywords

  • N-doped carbon nanosheets
  • alloyed FeNi nanoparticles
  • bifunctional electrocatalyst
  • rechargeable Zn-air batteries

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