Spinel-type lithium cobalt oxide as a bifunctional electrocatalyst for the oxygen evolution and oxygen reduction reactions

Thandavarayan Maiyalagan, Karalee A. Jarvis, Soosairaj Therese, Paulo J. Ferreira and Arumugam Manthiram ()
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Thandavarayan Maiyalagan: Materials Science and Engineering Program, The University of Texas at Austin
Karalee A. Jarvis: Materials Science and Engineering Program, The University of Texas at Austin
Soosairaj Therese: Materials Science and Engineering Program, The University of Texas at Austin
Paulo J. Ferreira: Materials Science and Engineering Program, The University of Texas at Austin
Arumugam Manthiram: Materials Science and Engineering Program, The University of Texas at Austin

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract Development of efficient, affordable electrocatalysts for the oxygen evolution reaction and the oxygen reduction reaction is critical for rechargeable metal-air batteries. Here we present lithium cobalt oxide, synthesized at 400 °C (designated as LT-LiCoO2) that adopts a lithiated spinel structure, as an inexpensive, efficient electrocatalyst for the oxygen evolution reaction. The catalytic activity of LT-LiCoO2 is higher than that of both spinel cobalt oxide and layered lithium cobalt oxide synthesized at 800 °C (designated as HT-LiCoO2) for the oxygen evolution reaction. Although LT-LiCoO2 exhibits poor activity for the oxygen reduction reaction, the chemically delithiated LT-Li1−xCoO2 samples exhibit a combination of high oxygen reduction reaction and oxygen evolution reaction activities, making the spinel-type LT-Li0,5CoO2 a potential bifunctional electrocatalyst for rechargeable metal-air batteries. The high activities of these delithiated compositions are attributed to the Co4O4 cubane subunits and a pinning of the Co3+/4+:3d energy with the top of the O2−:2p band.

Date: 2014
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DOI: 10.1038/ncomms4949

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