Electrochemical Behavior of Polyaniline-zeolite Composite Electrodes I. Redox of Copper-zeolites

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A composite electrode has been prepared by press of a mixture of zeolite and Teflonized acetylene black on platinum net and mooified with a conducting polymer，polyaniline by means of electrochemical polymerization. The electrodes have been investigated for electrochemical reactions of cupric ion as a function of type of zeolite Y or A, method of ion-exchange，and solution acidity. Oxidation potential of the trapped ion at zeolite shifted considerably in the anodic direction and the shift was interpreted as the cluster size of zero valent copper (Cu⁰) resulted in an energy shift of its redox reactions. Thus copper ion participating the redox reactions should exist within the pore sites of zeolite. The electrochemical response depended strongly on solution acidity. Polyaniline interfered for copper ion to concentrate in zeolite. The mechanisms of copper ion exchange and the polyaniline modification effect were discussed on the basis of acid-baseproperty of these substances.
室蘭工業大学の論文