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Insight into the processes controlling the electrochemical reactions of nanostructured iron oxide electrodes in Li- and Na-half cells
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
Arrhenius Laboratory, Department of Materials and Environmental Chemistry, Stockholm.
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2016 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 194, 74-83 p.Article in journal (Refereed) Published
Abstract [en]

The kinetics and the processes governing the electrochemical reactions of various types of iron oxide nanostructures (i.e., nanopowders, nanowires and thin-films) have been studied via cyclic voltammetry in parallel with Li- and Na-half cells containing analogous electrolytes (Li+/Na+, ClO4 in EC:DEC). The particular features arising from each electrode architecture are discussed and compared to shed light on the associated behaviour of the reacting nanostructured active materials. The influence of their characteristic structure, texture and electrical wiring on the overall conversion reaction upon their respective lithiation and sodiation has been analyzed carefully. The limiting factors existing for this reaction upon uptake of Li+ and Na+ ions are highlighted and the related issues in both systems are addressed. The results of this investigation clearly prove that the conversion of iron oxide into metallic Fe and Na2O is severely impeded compared to its analogous process upon lithiation, independently of the type of nanostructure involved in such reaction. The diffusion mechanisms of the different ions (i.e., Li+vs. Na+) through the phases formed upon conversion, as well as the influence of various interfaces on the resulting reaction, appear to pose further constraints on an efficient use of these compounds.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 194, 74-83 p.
Keyword [en]
Iron oxide; Na-ion batteries; Li-ion batteries; Electrode architectures; Limiting processes
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-283229DOI: 10.1016/j.electacta.2016.02.071ISI: 000372523300009OAI: oai:DiVA.org:uu-283229DiVA: diva2:918830
Funder
Swedish Research Council Formas, 245-2014-668Swedish Research Council, 2012-3392Knut and Alice Wallenberg Foundation
Available from: 2016-04-12 Created: 2016-04-12 Last updated: 2017-11-30Bibliographically approved

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The full text will be freely available from 2018-03-01 12:10
Available from 2018-03-01 12:10
The full text will be freely available from 2018-03-01 15:45
Available from 2018-03-01 15:45

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Publisher's full texthttp://www.sciencedirect.com/science/article/pii/S0013468616303462

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Valvo, MarioPhilippe, BertrandLindgren, FredrikEdström, Kristina

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