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

8 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

ASJC Scopus subject areas

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