Fe-based hybrid electrocatalysts for nonaqueous lithium-oxygen batteries

Seun Lee, Gwang Hee Lee, Hack Jun Lee, Mushtaq Ahmad Dar, Dong-Wan Kim

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Lithium-oxygen batteries promise high energy densities, but are confronted with challenges, such as high overpotentials and sudden death during discharge-charge cycling, because the oxygen electrode is covered with the insulating discharge product, Li2O2. Here, we synthesized low-cost Fe-based nanocomposites via an electrical wire pulse process, as a hybrid electrocatalyst for the oxygen electrode of Li-O2 batteries. Fe3O4-Fe nanohybrids-containing electrodes exhibited a high discharge capacity (13,890 mA h gc -1 at a current density of 500 mA gc -1), long cycle stability (100 cycles at a current rate of 500 mA gc -1 and fixed capacity regime of 1,000 mA h gc -1), and low overpotential (1.39 V at 40 cycles). This superior performance resulted from the good electrical conductivity of the Fe metal nanoparticles during discharge-charge cycling, which could enhance the oxygen reduction reaction and oxygen evolution reaction activities. We have demonstrated the increased electrical conductivity of the Fe3O4-Fe nanohybrids using electrochemical impedance spectroscopy.

Original languageEnglish
Article number9495
JournalScientific Reports
Volume7
Issue number1
DOIs
Publication statusPublished - 2017 Dec 1

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Electrocatalysts
Lithium
Oxygen
Electrodes
Metal nanoparticles
Electrochemical impedance spectroscopy
Nanocomposites
Current density
Wire
Costs
Electric Conductivity

ASJC Scopus subject areas

  • General

Cite this

Fe-based hybrid electrocatalysts for nonaqueous lithium-oxygen batteries. / Lee, Seun; Lee, Gwang Hee; Lee, Hack Jun; Dar, Mushtaq Ahmad; Kim, Dong-Wan.

In: Scientific Reports, Vol. 7, No. 1, 9495, 01.12.2017.

Research output: Contribution to journalArticle

Lee, Seun ; Lee, Gwang Hee ; Lee, Hack Jun ; Dar, Mushtaq Ahmad ; Kim, Dong-Wan. / Fe-based hybrid electrocatalysts for nonaqueous lithium-oxygen batteries. In: Scientific Reports. 2017 ; Vol. 7, No. 1.
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