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ACS Appl Mater Interfaces. 2018 Feb 14;10(6):5429-5439. doi: 10.1021/acsami.7b14599. Epub 2018 Jan 31.

Bifunctional Hybrid Catalysts with Perovskite LaCo0.8Fe0.2O3 Nanowires and Reduced Graphene Oxide Sheets for an Efficient Li-O2 Battery Cathode.

Author information

1
Carbon Resources Institute, Korea Research Institute of Chemical Technology (KRICT) , 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Republic of Korea.
2
Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH) , 77 Cheongam-Ro, Nam-gu, Pohang, Gyeongbuk 37673, Republic of Korea.

Abstract

In this paper, bifunctional catalysts consisting of perovskite LaCo0.8Fe0.2O3 nanowires (LCFO NWs) with reduced graphene oxide (rGO) sheets were prepared for use in lithium-oxygen (Li-O2) battery cathodes. The prepared LCFO@rGO composite was explored as a cathode catalyst for Li-O2 batteries, resulting in an outstanding discharge capacity (ca. 7088.2 mAh g-1) at the first cycle. Moreover, a high stability of the O2-cathode with the LCFO@rGO catalyst was achieved over 56 cycles under the capacity limit of 500 mAh g-1 with a rate of 200 mA g-1, as compared to the Ketjenblack carbon and LCFO NWs. The enhanced electrochemical performance suggests that these hybrid composites of perovskite LCFO NWs with rGO nanosheets could be a perspective bifunctional catalyst for the cathode oxygen reduction and oxygen evolution reactions in the development of next-generation Li-O2 battery cathodes.

KEYWORDS:

Li−O2 batteries; catalysts; graphene sheets; nanowires; perovskite LaCo0.8Fe0.2O3

PMID:
29345459
DOI:
10.1021/acsami.7b14599

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