THE ELECTROCHEMICAL SYNTHESIS AND DEINTERCALATION EFFECTS OF THE TERNARY CRO3-H2SO4-GRAPHITE INTERCALATION COMPOUND

The paper deals with the process of the subsequent intercalation of H2 SO4 into CrO3-graphite intercalation compound (CrO3-GIC). The results of the X-ray diffraction measurements and cyclic potentiodynamic scann ing show that in the course of the electrochemical intercalation the t ernary CrO3-H2SO4-GIC of stage-1 structure is synthesized. CrO3-H2SO4- GIC appears very resistant against both the cathodic reduction and tre atment with solvents. Deintercalation of CrO3-H2SO4-GIC results in the product of the better-ordered structure and surprisingly high concent ration of sulfur. To approach the mechanism of the intercalation/deint ercalation process the correlations between the current effects appear ing on the potentiodynamic curves and the structural changes observed on the X-ray diffraction patterns are considered.