Structure de la couche double sur les électrodes d'or: Détermination des composants de charge

Abstract

The components of the charge q ± Au at the interface polycrystalline gold electrode—NaF, KCl or KBr solutions and the charge due to specifically adsorbed Cl − or Br − anions have been determined by thermodynamical analysis of differential capacity—potential curves, using the two sets of variables q M, μ (Grahame and Soderberg's method) and E −, μ (Esin—Markov effect). In the absence of specific adsorption (NaF), variations of charges q ± Au with potential are in good agreement with those provided by the diffuse layer theory in the negative charge region of the metal. With specific adsorption of Cl − or Br − anions, both q ± Au( q Au), ( q − 1) Au( q Au) curves obtained by the two methods fit well. Determination of components of charge was made in the whole negative charge region and in part of the positive charge region of the electrode.