(Fe,Co)/N-Doped Multi-Walled Carbon Nanotubes as Efficient Bifunctional Electrocatalysts for Rechargeable Zinc-Air Batteries

Yugang Qi, Shan Yuan, Lili Cui, Zizhun Wang, Xingquan He, Wei Zhang, Tewodros Asefa

Research output: Contribution to journalArticlepeer-review

Abstract

The design and fabrication of efficient, less costly, and stable bifunctional oxygen electrode electrocatalysts is crucial for large-scale production of rechargeable zinc-air batteries. Herein, electrocatalytically active, hybrid materials composed of Fe−Co alloy nanoparticles-embedded N-doped carbon nanotubes (CNTs) are synthesized from Fe/Co-polyporphyrin-CNTs via pyrolysis. The materials serve as highly effective bifunctional oxygen electrode catalysts for zinc-air batteries. In particular, the one synthesized at 700 °C, named CNTs@(Fe,Co)PP-700, shows a very good activity for both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) in an alkaline solution. This material catalyzes ORR with a limiting current density of 5.11 mA cm−2 and a half-wave potential of 0.86 V vs RHE. It also catalyzes OER with 10 mA cm−2 at a small overpotential of 360 mV. Besides, it operates well as an air cathode in a home-made rechargeable zinc-air battery, with a small voltage gap of 0.71 V at 2 mA cm−2, while remaining stable in hundreds of charge-discharge cycles for >83 h. Its performance in a zinc-air battery is better than that of a benchmark air-electrode containing noble metals, Pt/C+RuO2.

Original languageEnglish (US)
Pages (from-to)1023-1033
Number of pages11
JournalChemCatChem
Volume13
Issue number3
DOIs
StatePublished - Feb 5 2021

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry

Keywords

  • Fe/Co-polyporphyrin
  • heteroatom-doped carbon nanotubes
  • oxygen evolution reaction
  • oxygen reduction reaction
  • zinc-air battery

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