An Efficient Oxygen Evolution Catalyst for Hybrid Lithium Air Batteries: Almond Stick Type Composite of Perovskite and Cobalt Oxide

An Efficient Oxygen Evolution Catalyst for Hybrid Lithium Air Batteries: Almond Stick Type Composite of Perovskite and Cobalt Oxide

We investigated the electrochemical composite effect between cobalt oxide and Nd0.5Sr0.5CoO3-δ (Co-NSC). A double phase Co-NSC composite was successfully synthesized by a new synthesis process rather than a single phase Nd0.5Sr0.5Co1.1O3-δ perovskite. The composite has good catalytic activity, high...

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Veröffentlicht in:Journal of the Electrochemical Society 2016-01, Vol.163 (9), p.A1893-A1897
Hauptverfasser: Gwon, Ohhun, Kim, Changmin, Kwon, Ohhun, Jeong, Hu Young, Park, Heai-Ku, Shin, Jeeyoung, Ju, Young-Wan, Kim, Guntae
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container_end_page A1897
container_issue 9
container_start_page A1893
container_title Journal of the Electrochemical Society
container_volume 163
creator Gwon, Ohhun
Kim, Changmin
Kwon, Ohhun
Jeong, Hu Young
Park, Heai-Ku
Shin, Jeeyoung
Ju, Young-Wan
Kim, Guntae
description We investigated the electrochemical composite effect between cobalt oxide and Nd0.5Sr0.5CoO3-δ (Co-NSC). A double phase Co-NSC composite was successfully synthesized by a new synthesis process rather than a single phase Nd0.5Sr0.5Co1.1O3-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 (
doi_str_mv 10.1149/2.0571609jes
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A double phase Co-NSC composite was successfully synthesized by a new synthesis process rather than a single phase Nd0.5Sr0.5Co1.1O3-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 (&lt;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 Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF), La1.7Sr0.3NiO4 (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. 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