Total exfoliation of graphite in molten salts

Adi Lavi, Michael Pyrikov, Avia Ohayon-Lavi, Rafael Tadmor, Gal Shachar-Michaely, Yelena Leibovitch, Efrat Ruse, Leonid Vradman, Oren Regev

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The exfoliation of graphite to graphene nanoplatelets (GnP) in a molten salt medium is investigated in this study. It is shown that this mechanical force-free process yielded a large-sized GnP product (>15 microns) with a low defect density. The effect of the surface tension of the molten salt on graphite exfoliation efficiency was investigated for a series of alkali chloride salts (CsCl, KCl, NaCl and eutectic NaCl-KCl) at 850 °C. It was demonstrated that the produced GnP could be completely and easily separated from the salt. Molten salt with the lowest value of surface tension (CsCl) displayed the highest wettability of the graphitic layers and hence facilitated total exfoliation of the graphite to GnP. The exfoliation of graphite in molten salts is applicable in the thermal energy storage field, as well as in exfoliation of other layered materials. Herein, it is demonstrated that the thermal conductivity of the GnP-CsCl composite is enhanced by ∼300% compared to the neat salt.

Original languageEnglish
Pages (from-to)2618-2628
Number of pages11
JournalPhysical Chemistry Chemical Physics
Volume25
Issue number3
DOIs
StatePublished - 18 Jan 2023

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