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Kim, Guntae
GUNS Lab
Research Interests
  • Solid Oxide Fuel Cells (SOFCs)& SOE, metal-air batteries, ceramic membranes, PEMFC

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An efficient oxygen evolution catalyst for hybrid lithium air batteries: Almond stick type composite of perovskite and cobalt oxide

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Title
An efficient oxygen evolution catalyst for hybrid lithium air batteries: Almond stick type composite of perovskite and cobalt oxide
Author
Gwon, OhhunKim, ChangminKwon, OhhunJeong, Hu YoungPark, Heai-KuShin, JeeyoungJu, Young-WanKim, Guntae
Keywords
Catalyst; Electrospinning; Hybrid Li-Air battery; Perovskite oxide
Issue Date
201607
Publisher
ELECTROCHEMICAL SOC INC
Citation
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.163, no.9, pp.A1893 - A1897
Abstract
We investigated the electrochemical composite effect between cobalt oxide and Nd0.5 Sr0.5 CoO3-δ (Co-NSC). A double phase Co-NSC composite was successfully synthesized by a new synthesis process rather than a single phase Nd0.5 Sr0.5 Co1.1 O3-δ perovskite. The composite has good catalytic activity, high number of transferred electrons (3.9) compatible with Pt/C, and low concentration of the peroxide species (HO- 2 ) yields (<5%). Also, it shows the outperformed onset potential (0.576 V vs. Hg/HgO) of the oxygen evolution reaction (OER) at -2.0 mA cm-2 , indicating higher current density than perovskite related catalysts such as Ba0.5 Sr0.5 Co0.8 Fe0.2 O3-δ (BSCF), La1.7 Sr0.3 NiO4 (LSN), LaNiO3 (LNO) and the state-of-the-art rutile IrO2 . The good catalytic activity of Co-NSC is ascribed to the higher amount of Co3+ cations and higher Oad /Olattice ratio. Interestingly, the cyclic performance of the composite is also remarkably stable without observable degradation in a hybrid lithium air cell. © 2016 The Electrochemical Society
URI
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DOI
http://dx.doi.org/10.1149/2.0571609jes
ISSN
0013-4651
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UCRF_Journal Papers
ECHE_Journal Papers

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