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Journal Articles Microporous and Mesoporous Materials Year : 2020

Intercalation of sodium and heavy alkali metals into graphenic foams

Lucie Speyer
Sébastien Fontana
Sébastien Cahen
Claire Hérold

Abstract

Most of alkali metals are well-known to easily intercalate into graphite to form stage-1 graphite intercalation compounds (GIC) whose structure and physical properties have been extensively studied. This work is focused on the intercalation of potassium, sodium and cesium into graphenic foams prepared by a solvothermal-based process. The as-obtained samples are analyzed by means of X-ray diffraction and Raman spectroscopy, and reveal a double phenomenon: the intercalation of alkali metals between the interplanar spaces of the multi-layer graphene stackings, and their sorption into the porosity of the host sample. This kind of behavior has already been reported when studying the reactivity of alkali metals with disordered carbon. Interestingly, our study shows a low stage intercalation in the case of sodium. Moreover, the dispersion of the potassium-intercalated samples into a polar solvent leads to a few-layer graphene dispersion stable for months.
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hal-02959666 , version 1 (07-10-2020)

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Lucie Speyer, Sébastien Fontana, Sébastien Cahen, Claire Hérold. Intercalation of sodium and heavy alkali metals into graphenic foams. Microporous and Mesoporous Materials, 2020, 306, pp.110344. ⟨10.1016/j.micromeso.2020.110344⟩. ⟨hal-02959666⟩
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