Towards a new definition of EPOC parameters for anionic electrochemical catalysts: case of propene combustion

Autor:	Philippe Vernoux, R. Karoum, Fernando Dorado, José Luis Valverde, Alain Billard, Antonio de Lucas-Consuegra
Rok vydání:	2008
Předmět:	Materials science General Chemical Engineering Inorganic chemistry Oxide chemistry.chemical_element Electrolyte Combustion Electrochemistry Catalysis Propene chemistry.chemical_compound chemistry Materials Chemistry Polarization (electrochemistry) Platinum
Zdroj:	Journal of Applied Electrochemistry. 38:1083-1088
ISSN:	1572-8838 0021-891X
DOI:	10.1007/s10800-008-9538-y
Popis:	The electrochemical promotion of catalysis (EPOC) of propene combustion was investigated using Pt sputtered thin film on an O2− conductor, 8 mol% Y2O3-stabilized-ZrO2 (YSZ). In order to separate the influence of the thermal migration of the O2− oxide ions from the electrolyte to the catalyst surface and the impact of an electrical polarization on the catalytic activity, several light-off experiments (cool down and heat up procedures) were successively performed under different polarizations, i.e. OCV, +2 and −2 V. These experiments have clearly shown that the presence of O2− (thermally or electrochemically induced) inhibits the catalytic activity of the platinum for the propene deep oxidation. These results demonstrate the importance to define a normalized rate enhancement ratio, ρ n , from a reference value of the catalytic rate corresponding to a Pt surface state free of O2− ions.
Databáze:	OpenAIRE
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