TY - JOUR
T1 - Molten salt in-situ exfoliation of graphite to graphene nanoplatelets applied for energy storage
AU - Ruse, Efrat
AU - Larboni, Mor
AU - Lavi, Adi
AU - Pyrikov, Michael
AU - Leibovitch, Yelena
AU - Ohayon-Lavi, Avia
AU - Vradman, Leonid
AU - Regev, Oren
N1 - Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/5/1
Y1 - 2021/5/1
N2 - The in-situ exfoliation of graphite in molten NaCl–KCl salt at 750 °C yielded a homogeneous composite, from which graphene nanoplatelets (GnP) could be easily and completely separated. The GnP product displayed relatively large-size particles (12 μm, TEM, SEM, laser diffraction) and low defect density (Raman, XPS), indicating the superiority of the molten salt exfoliation approach over the conventional liquid-phase approach for producing GnP. The mechanism of GnP production involves the formation of cavities in the molten salt, such that impregnation of the graphite by the molten material facilitated gentle exfoliation of the graphite to GnP. The methodology for the in-situ production of GnP in molten salt is highly applicable in the field of thermal energy storage, where molten inorganic salts are one of the most widely used heat-transfer fluids, such as phase-change materials. In graphite-GnP-salt composite, the thermal conductivity is enhanced by more than one order of magnitude compared to the neat salt matrix, which is essential for efficient thermal energy storage applications.
AB - The in-situ exfoliation of graphite in molten NaCl–KCl salt at 750 °C yielded a homogeneous composite, from which graphene nanoplatelets (GnP) could be easily and completely separated. The GnP product displayed relatively large-size particles (12 μm, TEM, SEM, laser diffraction) and low defect density (Raman, XPS), indicating the superiority of the molten salt exfoliation approach over the conventional liquid-phase approach for producing GnP. The mechanism of GnP production involves the formation of cavities in the molten salt, such that impregnation of the graphite by the molten material facilitated gentle exfoliation of the graphite to GnP. The methodology for the in-situ production of GnP in molten salt is highly applicable in the field of thermal energy storage, where molten inorganic salts are one of the most widely used heat-transfer fluids, such as phase-change materials. In graphite-GnP-salt composite, the thermal conductivity is enhanced by more than one order of magnitude compared to the neat salt matrix, which is essential for efficient thermal energy storage applications.
KW - Cavities
KW - Energy storage
KW - Graphene nanoplatelets
KW - Graphite
KW - Molten salts
UR - http://www.scopus.com/inward/record.url?scp=85100271905&partnerID=8YFLogxK
U2 - 10.1016/j.carbon.2021.01.133
DO - 10.1016/j.carbon.2021.01.133
M3 - Article
AN - SCOPUS:85100271905
SN - 0008-6223
VL - 176
SP - 168
EP - 177
JO - Carbon
JF - Carbon
ER -