ELECTRODES COATED BY HYDROTALCITE-LIKE CLAYS - EFFECT OF THE METALS AND THE INTERCALATED ANIONS ON ION ACCUMULATION AND RETENTION CAPABILITY

The influence of the nature of the di- and trivalent metals and of the interlayer anion of different hydrotalcite-like (HT) clays on the ani on-exchange ability is investigated. In view of the application of sim ilar clays as electrode coatings in electroanalysis and electrocatalys is, the responses of electrodes modified with the different HT to elec troactive species in solution constitute the primary source of informa tion. However, XRD measurements have proved to be invaluable tools whe n coupled with the electrochemical data. Two organic and one inorganic anion with reversible redox behaviour, i.e. anthraquinone mono-and di sulphonates and hexacyanoferrate(II), have been chosen as electroactiv e species. (C) 1998 Elsevier Science S.A. All rights reserved.