Identification of the surface species in electrochemical promotion: ethylene oxidation over a Pt/YSZ catalyst

Autor:	Mark T. Greiner, Axel Knop-Gericke, Arafat Toghan, Ronald Imbihl
Rok vydání:	2021
Předmět:	Materials science General Physics and Astronomy chemistry.chemical_element Yttrium Electrochemistry Redox Catalysis Overlayer chemistry X-ray photoelectron spectroscopy Chemical engineering Cubic zirconia Physical and Theoretical Chemistry Yttria-stabilized zirconia
Zdroj:	Physical Chemistry Chemical Physics
ISSN:	1463-9084 1463-9076
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8b9a267630fb26b3dc3d320ba3449fd5 https://doi.org/10.1039/d1cp02757c Zobrazit plný text záznamu