Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 21591-21598 |
| Seitenumfang | 8 |
| Fachzeitschrift | Physical Chemistry Chemical Physics |
| Jahrgang | 23 |
| Ausgabenummer | 38 |
| Frühes Online-Datum | 6 Sept. 2021 |
| Publikationsstatus | Veröffentlicht - 14 Okt. 2021 |
Abstract
The electrochemical promotion of the C2H4 + O2 total oxidation reaction over a Pt catalyst, interfaced to yttrium stabilized zirconia (YSZ), has been studied at 0.25 mbar and T = 650 K using near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) as an in situ method. The electrochemical promoter effect is linked to the presence of a several layers thick graphitic overlayer that forms on the Pt surface in the presence of C2H4. Our NAP-XPS investigation reveals that electrochemical pumping of the Pt/YSZ catalyst, using a positive potential, leads to the spillover of oxygen surface species from the YSZ support onto the surface of the Pt electrode. Based on the XP spectra, the spillover species on Pt is identical to oxygen chemisorbed from the gas-phase.
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in: Physical Chemistry Chemical Physics, Jahrgang 23, Nr. 38, 14.10.2021, S. 21591-21598.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Identification of the surface species in electrochemical promotion
T2 - Ethylene oxidation over a Pt/YSZ catalyst
AU - Toghan, Arafat
AU - Greiner, Mark
AU - Knop-Gericke, Axel
AU - Imbihl, Ronald
N1 - Funding Information: The authors thank the Helmholtz-Zentrum Berlin for beam time at the electron storage ring BESSY II and the authors thank the BESSY staff for help and support. Financial support from the Deutsche Forschungsgemeinschaft (DFG) is gratefully acknowledged.
PY - 2021/10/14
Y1 - 2021/10/14
N2 - The electrochemical promotion of the C2H4 + O2 total oxidation reaction over a Pt catalyst, interfaced to yttrium stabilized zirconia (YSZ), has been studied at 0.25 mbar and T = 650 K using near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) as an in situ method. The electrochemical promoter effect is linked to the presence of a several layers thick graphitic overlayer that forms on the Pt surface in the presence of C2H4. Our NAP-XPS investigation reveals that electrochemical pumping of the Pt/YSZ catalyst, using a positive potential, leads to the spillover of oxygen surface species from the YSZ support onto the surface of the Pt electrode. Based on the XP spectra, the spillover species on Pt is identical to oxygen chemisorbed from the gas-phase.
AB - The electrochemical promotion of the C2H4 + O2 total oxidation reaction over a Pt catalyst, interfaced to yttrium stabilized zirconia (YSZ), has been studied at 0.25 mbar and T = 650 K using near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) as an in situ method. The electrochemical promoter effect is linked to the presence of a several layers thick graphitic overlayer that forms on the Pt surface in the presence of C2H4. Our NAP-XPS investigation reveals that electrochemical pumping of the Pt/YSZ catalyst, using a positive potential, leads to the spillover of oxygen surface species from the YSZ support onto the surface of the Pt electrode. Based on the XP spectra, the spillover species on Pt is identical to oxygen chemisorbed from the gas-phase.
UR - http://www.scopus.com/inward/record.url?scp=85117040830&partnerID=8YFLogxK
U2 - 10.1039/d1cp02757c
DO - 10.1039/d1cp02757c
M3 - Article
AN - SCOPUS:85117040830
VL - 23
SP - 21591
EP - 21598
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
SN - 1463-9076
IS - 38
ER -