Tuning C–F Bonding of Graphite Fluoride by Applying High Pressure: Experimental and Theoretical Study - Université Clermont Auvergne Access content directly
Journal Articles Journal of Physical Chemistry C Year : 2020

Tuning C–F Bonding of Graphite Fluoride by Applying High Pressure: Experimental and Theoretical Study

Abstract

C2F graphite fluoride has a unique mutable structure when subjected to external applied pressure. In the present study, we examine C2F using X-ray Raman scattering (XRS) up to 6.5 GPa coupled with theoretical simulations. Using the XRS technique, we follow the in situ high-pressure evolution of the energy loss corresponding to the C and F K-edge. Significant variations occur at 2.9 GPa, remain up to 6.5 GPa, and persist at ambient conditions after decompression. The permanent changes are related to an increased planarity of the graphitic layers and a modulation of the fluorine configuration. The all-electron density of a C2F-sp3 slab obtained from the DFT simulation and the quantum theory of atoms in molecules reveals the appearance of bond-critical points between in-plane and out-of-plane F–F, suggesting an increasingly ionic character of the structure under biaxial isotropic strain. Pressure can be used as an alternative to chemical synthesis for tuning C–F bonding and metastabilizing new intercalated fluorine compounds with potentially improved electrochemical properties.
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Dates and versions

hal-03026142 , version 1 (26-11-2020)

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C. Cavallari, S. Radescu, M. Dubois, N. Batisse, H. Diaf, et al.. Tuning C–F Bonding of Graphite Fluoride by Applying High Pressure: Experimental and Theoretical Study. Journal of Physical Chemistry C, 2020, 124 (45), pp.24747-24755. ⟨10.1021/acs.jpcc.0c06860⟩. ⟨hal-03026142⟩
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