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Reversible Electrochemical Intercalation and Deintercalation of Fluoride Ions into Host Lattices with Schafarzikite-Type Structure

Nowroozi, Mohammad Ali and de Laune, Benjamin and Clemens, Oliver (2018):
Reversible Electrochemical Intercalation and Deintercalation of Fluoride Ions into Host Lattices with Schafarzikite-Type Structure.
7, In: ChemistryOpen, (8), pp. 617-623. Wiley-VCH Verlag GmbH, Weinheim, ISSN 21911363,
DOI: 10.1002/open.201800106,
[Article]

Abstract

Herein, we report the successful electrochemical fluorination and defluorination of schafarzikite‐type compounds with the composition Fe0.5M0.5Sb2O4 (M=Mg or Co). We show that electrochemical methods can present a more controllable and less environmentally damaging route for fluorinating compounds in contrast to traditional methods that involve heating samples in F2‐rich atmospheres. The reactivity of the host lattices with fluoride during electrochemical fluorination makes this material an interesting candidate for fluoride‐ion battery applications. However, deleterious side reactions with the conductive carbon matrix during fluorination suggests to the contrary. Regardless of the side reactions, the schafarzikite structure was found to be an alternative reversible host lattice for fluoride incorporation and removal in addition to the previously reported Ruddlesden–Popper‐type compounds.

Item Type: Article
Erschienen: 2018
Creators: Nowroozi, Mohammad Ali and de Laune, Benjamin and Clemens, Oliver
Title: Reversible Electrochemical Intercalation and Deintercalation of Fluoride Ions into Host Lattices with Schafarzikite-Type Structure
Language: English
Abstract:

Herein, we report the successful electrochemical fluorination and defluorination of schafarzikite‐type compounds with the composition Fe0.5M0.5Sb2O4 (M=Mg or Co). We show that electrochemical methods can present a more controllable and less environmentally damaging route for fluorinating compounds in contrast to traditional methods that involve heating samples in F2‐rich atmospheres. The reactivity of the host lattices with fluoride during electrochemical fluorination makes this material an interesting candidate for fluoride‐ion battery applications. However, deleterious side reactions with the conductive carbon matrix during fluorination suggests to the contrary. Regardless of the side reactions, the schafarzikite structure was found to be an alternative reversible host lattice for fluoride incorporation and removal in addition to the previously reported Ruddlesden–Popper‐type compounds.

Journal or Publication Title: ChemistryOpen
Volume: 7
Number: 8
Publisher: Wiley-VCH Verlag GmbH, Weinheim
Uncontrolled Keywords: electrochemical fluorination, fluoride-ion batteries, schafarzikite type structure, topochemical reactions, X-ray diffraction
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Fachgebiet Materialdesign durch Synthese
Date Deposited: 11 Dec 2018 14:39
DOI: 10.1002/open.201800106
Official URL: https://doi.org/10.1002/open.201800106
Funders: This work was funded by the German Research Foundation (grant no CL551/2‐1)., B.d.L. acknowledges the EPSRC for financial support (EP/L014114/1)., We further acknowledge support by the German Research Foundation (DFG) and the Open Access Publishing Fund of Technische Universität Darmstadt.
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