The role of vacancies and defects in Na0.44MnO2 nanowire catalysts for lithium–oxygen batteries

Jin-Hyon Lee; Robert Black; Guerman Popov; Ekaterina Pomerantseva; Feihong Nan; Gianluigi A. Botton; Linda F. Nazar

doi:10.1039/C2EE21543H

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The role of vacancies and defects in Na_0.44MnO₂ nanowire catalysts for lithium–oxygen batteries†

Jin-Hyon Lee,^a Robert Black,^a Guerman Popov,^a Ekaterina Pomerantseva,^a Feihong Nan,^b Gianluigi A. Botton^b and Linda F. Nazar*^a

Author affiliations

* Corresponding authors

^a Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada
E-mail: lfnazar@uwaterloo.ca

^b Department of Materials Science and Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada

Abstract

Na_0.44MnO₂ nanowires were acid leached in nitric acid, and dehydrated by heat treatment to induce controllable defect formation as monitored by high resolution TEM studies. The charge–discharge tests using these materials as catalysts (or “promoters”) in rechargeable lithium–oxygen batteries (in non-carbonate electrolytes) showed that a high defect concentration results in a doubling of the reversible energy storage capacity up to 11 000 mA h g⁻¹, and lowered overpotentials for oxygen evolution. The role of the defects/vacancies in determining oxygen reduction behavior is highlighted.

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Article information

DOI: https://doi.org/10.1039/C2EE21543H
Article type: Paper
Submitted: 12 Dec 2011
Accepted: 02 Aug 2012
First published: 02 Aug 2012

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Energy Environ. Sci., 2012,5, 9558-9565

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The role of vacancies and defects in Na_0.44MnO₂ nanowire catalysts for lithium–oxygen batteries

J. Lee, R. Black, G. Popov, E. Pomerantseva, F. Nan, G. A. Botton and L. F. Nazar, Energy Environ. Sci., 2012, 5, 9558 DOI: 10.1039/C2EE21543H

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