Permanent electrochemical promotion of C3H8 oxidation over thin sputtered Pt films |
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Authors: | S Souentie L Lizarraga EI Papaioannou CG Vayenas P Vernoux |
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Institution: | 1. Université de Lyon, Institut de Recherches sur la Catalyse et l''Environnement de Lyon, UMR 5256, CNRS, Université Claude Bernard Lyon 1, 2 avenue A. Einstein, 69626 Villeurbanne, France;2. LCEP, Department of Chemical Engineering, University of Patras, Caratheodory 1Str, GR26500 Patras, Greece |
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Abstract: | The effect of “permanent electrochemical promotion of catalysis” (P-EPOC) was studied for the first time in the catalytic deep oxidation of C3H8 over a thin (~ 150 nm) sputtered Pt film on YSZ, under excess of oxygen at 350 °C. Short positive potential application (+ 1 V) resulted in a 5.6-fold increase of the catalytic rate, where C3H8 conversion reached 33%, while the apparent Faradaic efficiency was ~ 330. After positive current interruption the catalytic rate remained in a highly active steady-state, determined by the total charge of the anodic polarization step. Restoration of the catalytic activity to the initial value occurred only by a similar negative potential imposition. This new stable steady-state after current interruption can be interpreted by storage of a non-reactive oxygen species upon anodic polarization at the proximity of the Pt/YSZ interface and subsequent enhanced migration of spillover Oδ? species from the electrolyte support to the Pt/gas interface under open-circuit conditions. |
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