Details
| Original language | English |
|---|---|
| Pages (from-to) | 5241-5249 |
| Number of pages | 9 |
| Journal | Physical Chemistry Chemical Physics |
| Volume | 1 |
| Issue number | 22 |
| Publication status | Published - 1999 |
Abstract
Catalytic CO oxidation has been investigated under low pressure conditions (p ≃ 10-6 mbar) employing porous Pt films on a solid state electrolyte (yttrium stabilized ZrO2 = YSZ) as catalyst. The samples were characterized by impedance spectroscopy and linear sweep voltammetry before rate measurements were conducted in an UHV chamber with a differentially pumped mass spectrometer, a Kelvin probe for integral and a photoelectron emission microscope (PEEM) for spatially resolved measurements of the work function (WF). Different types of samples prepared by different groups were investigated. An electrocatalytic effect was found for all samples but within the experimental uncertainty (up to a factor of two) the effect was Faradaic. Surprisingly, despite nearly identical electrochemical characteristics the electrocatalytic behavior of the catalysts with the porous Pt films varied drastically depending on the preparation. Whereas on the samples provided from a different group the WF of the porous Pt films followed more or less the variation in the electric potential (V(WR)), the samples prepared here exhibited no detectable WF change at all upon variation of V(WR). Within the spatial resolution of PEEM (Δx ≃ 1 μm) the observed WF changes occurred spatially homogeneous.
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In: Physical Chemistry Chemical Physics, Vol. 1, No. 22, 1999, p. 5241-5249.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Electrochemical promotion of catalytic CO oxidation on Pt/YSZ catalysts under low pressure conditions
AU - Poppe, Jens
AU - Völkening, Stefan
AU - Schaak, Andreas
AU - Schütz, Eckart
AU - Janek, Jürgen
AU - Imbihl, Ronald
N1 - Acknowledgements We are grateful to Prof. R. Haul (Hannover) for his motivating suggestions and Prof. H. Schmalzried (Hannover) for his support and interest in this study. We thank Prof. C. Vayenas (Patras) for the supply of several YSZ samples.
PY - 1999
Y1 - 1999
N2 - Catalytic CO oxidation has been investigated under low pressure conditions (p ≃ 10-6 mbar) employing porous Pt films on a solid state electrolyte (yttrium stabilized ZrO2 = YSZ) as catalyst. The samples were characterized by impedance spectroscopy and linear sweep voltammetry before rate measurements were conducted in an UHV chamber with a differentially pumped mass spectrometer, a Kelvin probe for integral and a photoelectron emission microscope (PEEM) for spatially resolved measurements of the work function (WF). Different types of samples prepared by different groups were investigated. An electrocatalytic effect was found for all samples but within the experimental uncertainty (up to a factor of two) the effect was Faradaic. Surprisingly, despite nearly identical electrochemical characteristics the electrocatalytic behavior of the catalysts with the porous Pt films varied drastically depending on the preparation. Whereas on the samples provided from a different group the WF of the porous Pt films followed more or less the variation in the electric potential (V(WR)), the samples prepared here exhibited no detectable WF change at all upon variation of V(WR). Within the spatial resolution of PEEM (Δx ≃ 1 μm) the observed WF changes occurred spatially homogeneous.
AB - Catalytic CO oxidation has been investigated under low pressure conditions (p ≃ 10-6 mbar) employing porous Pt films on a solid state electrolyte (yttrium stabilized ZrO2 = YSZ) as catalyst. The samples were characterized by impedance spectroscopy and linear sweep voltammetry before rate measurements were conducted in an UHV chamber with a differentially pumped mass spectrometer, a Kelvin probe for integral and a photoelectron emission microscope (PEEM) for spatially resolved measurements of the work function (WF). Different types of samples prepared by different groups were investigated. An electrocatalytic effect was found for all samples but within the experimental uncertainty (up to a factor of two) the effect was Faradaic. Surprisingly, despite nearly identical electrochemical characteristics the electrocatalytic behavior of the catalysts with the porous Pt films varied drastically depending on the preparation. Whereas on the samples provided from a different group the WF of the porous Pt films followed more or less the variation in the electric potential (V(WR)), the samples prepared here exhibited no detectable WF change at all upon variation of V(WR). Within the spatial resolution of PEEM (Δx ≃ 1 μm) the observed WF changes occurred spatially homogeneous.
UR - http://www.scopus.com/inward/record.url?scp=0033570383&partnerID=8YFLogxK
U2 - 10.1039/a905094i
DO - 10.1039/a905094i
M3 - Article
AN - SCOPUS:0033570383
VL - 1
SP - 5241
EP - 5249
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
SN - 1463-9076
IS - 22
ER -