NEW ASPECTS OF ISOPOLYANIONS AND HETEROPOLYANIONS IN ELECTROCHEMISTRY- CHEMICALLY-MODIFIED ELECTRODES, CATALYSIS

Two different aspects of the work carried out in our group on the elec trochemistry of oxometalates are briefly reviewed. They concern first the STM observation of H2W12O406- on graphic electrodes during cyclic voltammetry experiments. These layers are believed to constitute the p recursors for the electrochemical activation of electrode surfaces by oxometalates. The second part of the paper is devoted to the electroca talysis of the reduction of nitrite and nitric oxide by polyoxometalat e/polymer systems. (C) Academie des Sciences/Elsevier, Paris.