ELECTROCHEMICAL-BEHAVIOR OF INORGANIC REDOX SYSTEMS DURING FLUORIDE INTERCALATION ON GRAPHITE IN AQUEOUS-METHANOLIC HF SOLUTIONS

The electrochemical behaviour of well-polished graphite electrode has been compared with that of an electrode which was roughened by fluorid e intercalation/deintercalation process. 15 M HF aqueous-methanolic me dium was employed for the study of intercalation/deintercalation as we ll as some redox processes containing potassium salt of ferricyanide/f errocyanide, bromide/bromine and iodide/iodine. In all the three cases , the redox species were found to adhere to the electrochemically roug hened electrode surface. SEM studies indicate the formation of small s alt crystallites on the surface. The possible impact of such films on other electron transfer processes is discussed.