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

ChemistryOpen
Mohammad Ali NowrooziOliver Clemens

Abstract

Herein, we report the successful electrochemical fluorination and defluorination of schafarzikite-type compounds with the composition Fe0.5 m 0.5Sb2O4 (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.

References

Dec 24, 2010·Nano Letters·Hyungtak SeoGabor A Somorjai
Jan 22, 2014·Journal of the American Chemical Society·Eun Ju MoonSteven J May
Sep 12, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Oliver ClemensHorst Hahn
May 5, 2016·Microscopy Research and Technique·Mohammed Hammad FaweyChristian Kübel
Mar 9, 2017·ACS Applied Materials & Interfaces·Tomoya OnozukaTetsuya Hasegawa

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electrochemical treatment
neutron powder diffraction

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