J. Phys. IV France 04 (1994) C9-167-C9-170
Investigations of exfoliating graphite intercalation compounds using time-resolved DEXAFST. Ressler, U. Hatje, S. Twumasi, K. Lochte and W. Metz
Institute of Physical Chemistry, University of Hamburg, Bundesstr. 45, 20146 Hamburg, Germany
The exfoliation processes (rapid thermal decomposition) of CuCl2 graphite intercalation compounds (GICs) cointercalated with FeCl3 or AlCl3 were investigated using time resolved X-ray absorption spectroscopy in an energy dispersive mode. The experiments were carried out at the DEXAFS beam line at HASYLAB (Hamburg). The evolution of the absorption spectra of the Cu K-edge was compared with the reaction of pure CuCl2 under the same conditions. From the exfoliation of the CuCl2/AlCl3-GIC a CuO graphite compound can be obtained. The formation resembles the reaction of pure CuCl2, whereas the exfoliation of the CuCl2/FeCl3-GIC results in a mixture of Cu2O, CuO and Cu clusters. The reduction of the Cu(II) at a reaction temperature of 500°C is correlated with an oxidation of Fe(II) to Fe(III).
© EDP Sciences 1994