Étude des anodes à couche d'oxyde de ruthénium sur substrat de titane I. Relation entre la morphologie des couches et les cinétiques de dégagement du chlore et de l'oxygène

Abstract

We have studied the relations between the conditions of preparation of insoluble anodes deposited on titanium substrates by thermal decomposition of RuCl 3 and TiCl 3 aqueous solutions and triangular voltammetric curves of solutions of NaCl 1M and NaClO 4 1M at pH = 3. As the percentage of TiCl 3 is increased the morphology of the electrode does not vary, but chlorine and oxygen overvoltages are higher. This phenomenon is more important for oxygen. Raising the decomposition temperature decreases the active area of the electrode, most probably by interaction with the substrate. This is reflected in the transformation of the morphology. The presence of a preformed TiO 2 layer on the titanium before treatment increases the adhesion of the layers made from the mixture of salts, but increases the ohmic drop.