Abstract
Platinum chloride-graphite intercalation compounds (PtCl4-GICs) were synthesized from platinum chloride (PtCl4) and graphite under pressurized chlorine atmosphere. The analysis of XRD patterns showed that platinum chloride was inserted into graphite layers and the PtCI4-GICs with a stage 3 structure were formed. The curve-fitting analysis of Pt LIII-edge EXAFS showed that the distance of the Pt-Cl-Pt bond of 5 wt% PtCl4-GIC was 0.06 A longer than that of the PtCl4 bulk, indicating that PtCl4 had a distorted structure in graphite layers. PtCl4 samples were reduced in hydrogen atmosphere to produce platinum metal particles in graphite layers. EXAFS analysis showed that the coordination numbers of Pt-Pt metal bond for PtCl4-GIC samples reduced at various temperatures were lower than those of the mixture of PtCl4 and graphite (PtCl4-Gmix) samples reduced in the same manners.
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