Electromodulated infrared spectroscopy of methanol electrooxidation on electrodispersed platinum electrodes: Enhancement of reactive intermediates

EMIRS spectra of the surface species resulting from methanol electrosorption on electrodispersed Pt were obtained by working under a wide range of experimental conditions, i.e. electrode roughness factor, methanol concentration and mean modulation potential. The intensity of the absorption band related to linearly adsorbed CO-species, COL, at ca. 2030–2080 cm−1 decreases on increasing the electrode roughness factor, a fact which is interpreted as a decrease in the CO adsorbate poisoning effect on electrodispersed Pt surfaces. As a consequence, under well-defined conditions, several bands are observed which might be assigned to adsorbed intermediates and reactive species. EMIRS also reveals a competition between COB and COL at high surface coverages. Spectral data for methanol electrooxidation on electrodispersed electrodes correlate well with the expected structure of this type of electrode.Instituto de Investigaciones Fisicoquímicas Teóricas y AplicadasFacultad de Ciencias Exacta

Electromodulated infrared spectroscopy of methanol electrooxidation on electrodispersed platinum electrodes: Enhancement of reactive intermediates

EMIRS spectra of the surface species resulting from methanol electrosorption on electrodispersed Pt were obtained by working under a wide range of experimental conditions, i.e. electrode roughness factor, methanol concentration and mean modulation potential. The intensity of the absorption band related to linearly adsorbed CO-species, COL, at ca. 2030–2080 cm−1 decreases on increasing the electrode roughness factor, a fact which is interpreted as a decrease in the CO adsorbate poisoning effect on electrodispersed Pt surfaces. As a consequence, under well-defined conditions, several bands are observed which might be assigned to adsorbed intermediates and reactive species. EMIRS also reveals a competition between COB and COL at high surface coverages. Spectral data for methanol electrooxidation on electrodispersed electrodes correlate well with the expected structure of this type of electrode.Instituto de Investigaciones Fisicoquímicas Teóricas y AplicadasFacultad de Ciencias Exacta

Electromodulated infrared spectroscopy of methanol electrooxidation on electrodispersed platinum electrodes: Enhancement of reactive intermediates

EMIRS spectra of the surface species resulting from methanol electrosorption on electrodispersed Pt were obtained by working under a wide range of experimental conditions, i.e. electrode roughness factor, methanol concentration and mean modulation potential. The intensity of the absorption band related to linearly adsorbed CO-species, COL, at ca. 2030–2080 cm−1 decreases on increasing the electrode roughness factor, a fact which is interpreted as a decrease in the CO adsorbate poisoning effect on electrodispersed Pt surfaces. As a consequence, under well-defined conditions, several bands are observed which might be assigned to adsorbed intermediates and reactive species. EMIRS also reveals a competition between COB and COL at high surface coverages. Spectral data for methanol electrooxidation on electrodispersed electrodes correlate well with the expected structure of this type of electrode.Instituto de Investigaciones Fisicoquímicas Teóricas y AplicadasFacultad de Ciencias Exacta

Équation cinétique généralisée (incluant un facteur de symétrie) décrivant certaines réactions hétérogènes solide-gaz gouvernées par un régime mixte

Les équations de Billy Valensi (1), décrivant en cinétique hétérogène la réaction d’un grain ou d’un fil avec un gaz, lorsque la germination est instantanée, ont été généralisées à tous les cas de géométrie du réactif initial par l’introduction d'un facteur de symétrie p.Diverses applications sont proposées: on peut notamment envisager l’étude (tout au moins théorique) des réactions complexes mettant en jeu simultanément les composantes interfaciales interne, externe et diffusive, même dans le cas où la caractéristique géométrique initiale du réactif s’altérerait progressivement en cours de réaction

Etude par electroreflexion IR in situ de l'activite electrocatalytique d'electrodes de nickel en vue de leur utilisation dans les piles a alcools

CNRS RP 440 (160) / INIST-CNRS - Institut de l'Information Scientifique et TechniqueSIGLEFRFranc

Modification de l'activite et de la selectivite d'electrodes metalliques a base de platine vis a vis de l'oxydation electrocatalytique du glucose Application a la conception d'une pile au glucose

A.T.P. Preparations electrochimiques et generateurs electrochimiquesSIGLEAvailable at INIST (FR), Document Supply Service, under shelf-number : RP 440 (367) / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc