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O. N. Shornikova, N. Ye. Sorokina, N. V. Maksimova, V. V. Avdeev
Thermal Properties of the
graphite intercalation compounds, synthesized in the graphite–H2SO4–R system (R = H2O, C2H5OH, C2H5COOH)
Abstract
The systematic investigation
of the thermal properties of graphite intercalation compounds (GIC), synthesized
in the electrolyte made of H2SO4 – R solutions (R = H2O, C2H5OH, C2H5COOH),
was carried out for the first time. The composition of the gaseous phase
involved during decomposition of the GIC was analyzed by IR – spectroscopy and
mass – spectrometry. It is shown that GICs synthesized in the combined
electrolyte are less stable than those obtained in 94% H2SO4
independently of the solvent nature. It is established the deintercalation of
the acids from graphite matrix starts at 150–170oC.
Further thermal treatment of the GICs results absolute deintercalation of the
acids and the final product is graphite (d00l = 3.36 E). The
enthalpies of decomposition were determined, they are equal to 5–22 kJ/molC and
do not surpass Van-der-Vaals interactions.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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