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 language | English |
|---|---|
| Article number | 9495 |
| Journal | Scientific Reports |
| Volume | 7 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2017 Dec 1 |
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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 journal › Article
}
TY - JOUR
T1 - Fe-based hybrid electrocatalysts for nonaqueous lithium-oxygen batteries
AU - Lee, Seun
AU - Lee, Gwang Hee
AU - Lee, Hack Jun
AU - Dar, Mushtaq Ahmad
AU - Kim, Dong-Wan
PY - 2017/12/1
Y1 - 2017/12/1
N2 - 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.
AB - 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.
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U2 - 10.1038/s41598-017-09982-9
DO - 10.1038/s41598-017-09982-9
M3 - Article
C2 - 28842692
AN - SCOPUS:85028350474
VL - 7
JO - Scientific Reports
JF - Scientific Reports
SN - 2045-2322
IS - 1
M1 - 9495
ER -