journal article·2022-07-08

Room-Temperature Electrochemical Fluoride (De)insertion into CsMnFeF 6

Jessica L. Andrews, Eric T. McClure, Kenneth K. Jew, Molleigh B. Preefer, Ahamed Irshad, Matthew J. Lertola, Daniel D. Robertson, Charlene Z. Salamat, Michael J. Brady, Louis F. J. Piper, Sarah H. Tolbert, Johanna Nelson Weker, Bradley F. Chmelka, Bruce S. Dunn, Sri R. Narayan, William C. West, Brent C. Melot

ACS Energy Letters· Volume 7· Issue 7
Publisher page

Abstract

We report on the reversible, electrochemical (de)fluorination of CsMnFeF6 at room temperature using a liquid electrolyte. CsMnFeF6 was synthesized via three methods (hydrothermal, ceramic, and mechanochemical), each of which yields products in a defect pyrochlore structure with varying particle sizes and phase purities. After three galvanostatic cycles, approximately one fluoride ion can be reversibly (de)inserted into mechanochemical CsMnFeF6 for multiple cycles. Ex situ X-ray absorption spectroscopy confirmed that both Mn2+ and Fe3+ are redox active. The cell impedance decreases after one cycle, suggesting that the formation of fluoride vacancies in early cycles generates mixed-valent Fe and enhances the material’s conductivity. Ex situ synchrotron diffraction revealed subtle expansion and contraction of the CsMnFeF6 cubic lattice on insertion and removal, respectively, during the first two cycles. New reflections intensify in the ex situ diffraction patterns from cycle 3, corresponding to a topotactic transformation of CsMnFeF6 from the pyrochlore structure into an orthorhombic polytype that continues cycling fluoride ions reversibly.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Inorganic Fluorides and Related Compounds · Luminescence Properties of Advanced Materials · Advancements in Battery Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States

Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089, United States

Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States

Department of Chemical Engineering, University of California, Santa Barbara, Santa Barbara, California 93106, United States

Department of Chemistry and Biochemistry, University of California at Los Angeles, Los Angeles, California 90095, United States

Warwick Manufacturing Group, University of Warwick, Coventry CV4 7AL, United Kingdom

Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, New York 13902, United States

Department of Materials Science and Engineering, University of California at Los Angeles, Los Angeles, California 90095, United States

The California NanoSystems Institute, University of California at Los Angeles, Los Angeles, California 90095, United States

Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, United States

Funding

Basic Energy Sciences · Jet Propulsion Laboratory · Division of Graduate Education

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