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

Jong Guk Kim; Youngmin Kim; Yuseong Noh; Seonhwa Lee; Yoongon Kim; Won Bae Kim

doi:10.1021/acsami.7b14599

Bifunctional Hybrid Catalysts with Perovskite LaCo_0.8Fe_0.2O₃ Nanowires and Reduced Graphene Oxide Sheets for an Efficient Li-O₂ Battery Cathode

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

Authors

Jong Guk Kim, Youngmin Kim¹, Yuseong Noh², Seonhwa Lee, Yoongon Kim², Won Bae Kim²

Affiliations

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.

PMID: 29345459
DOI: 10.1021/acsami.7b14599

Abstract

In this paper, bifunctional catalysts consisting of perovskite LaCo_0.8Fe_0.2O₃ 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.