Electrochemical promotion of the water-gas shift reaction on Pt/YSZ
| Autor: | Leonardo Lizarraga, M. Alves-Fortunato, S. Souentie, Anastasios Kambolis, José Luis Valverde, Philippe Vernoux |
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| Přispěvatelé: | AIR (AIR), Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC) |
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Chemistry
Inorganic chemistry Analytical chemistry Water gas 02 engineering and technology [CHIM.CATA]Chemical Sciences/Catalysis 010402 general chemistry 021001 nanoscience & nanotechnology Heterogeneous catalysis Electrochemistry 01 natural sciences 7. Clean energy [SDE.ES]Environmental Sciences/Environmental and Society Catalysis Dissociation (chemistry) Water-gas shift reaction 0104 chemical sciences Reaction rate Physical and Theoretical Chemistry 0210 nano-technology Faraday efficiency |
| Zdroj: | Journal of Catalysis Journal of Catalysis, Elsevier, 2011, 283, pp.124-132. ⟨10.1016/j.jcat.2011.07.009⟩ |
| ISSN: | 0021-9517 1090-2694 |
| DOI: | 10.1016/j.jcat.2011.07.009⟩ |
| Popis: | The effect of electrochemical promotion of catalysis was investigated for the water–gas shift reaction over porous Pt catalyst electrodes interfaced with 8%mol Yttria-stabilized Zirconia. A fuel cell type electrochemical reactor was used at temperatures from 300 °C to 400 °C, under P H 2 O / P CO ratio values from 2.85 to 31. A negative order dependence of the catalytic reaction rate on P CO and a positive one on P H 2 O was found under open-circuit and polarization conditions. Positive potential application (+2.5 V), i.e., O 2− supply to the catalyst surface, causes a small decrease in the catalytic reaction rate, while negative potential application (−1.5 V) results in a pronounced rate increase, up to 200%, with apparent faradaic efficiency values up to 110. The rate increase obtained with negative polarization can be attributed to the weakening of the Pt–CO bond strength but also, to the increase in surface concentration of oxygen ion vacancies near the Pt-gas-support three-phase boundaries necessary for water dissociation. |
| Databáze: | OpenAIRE |
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