New effects in the electrochemistry of carbon dioxide on platinum by the application of potential perturbations

The electroformation and electrooxidation of carbon dioxide adsorbates were studied on polycrystalline and preferentially oriented platinum surfaces b y the application of medium frequency potential perturbations in saturated carbon dioxide aqueous sulphuric acid solutions. Preferentially oriented pl atinum surfaces were obtained by the application of fast symmetric square w ave potential programmes to polycrystalline electrodes based on well-known methodology. Two new electrochemical characteristics for the electrochemist ry of carbon dioxide were observed after the application of the medium freq uency routines, that is, an extended adsorption potential domain for the fo rmation of carbon dioxide adsorbates, and novel voltammetric features for t he two anodic stripping peaks. These effects upon carbon dioxide electroche mistry are dependent on the morphology of the platinum electrode surface an d adsorption potentials. (C) 1999 Elsevier Science S.A. All rights reserved .