Ceria nanoformations in CO oxidation on Pt(111): Promotional effects and reversible redox behaviour

Suchorski, Yuri; Wróbel, Rafał; Becker, Stefan; Strzelczyk, B.; Drachsel, W.; Weiß, Helmut

doi:10.1016/j.susc.2007.07.029

Cited by 31 publications

(46 citation statements)

References 58 publications

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“…Recently it was shown, that such “stranger” oxides present on the platinum-metal surface can significantly influence the reaction, even at small oxide coverages [21, 22]. It is also known that impurities commonly present in commercially used catalysts, such as Si, might form surface oxides under oxidizing atmosphere [23], but, to our knowledge, aimed studies of such oxides under reaction conditions are very scarce.…”

Section: Introductionmentioning

confidence: 99%

Silicon Oxide Surface Segregation in CO Oxidation on Pd: An in situ PEEM, MS and XPS Study

et al. 2013

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The effect of silicon oxide surface segregation on the locally-resolved kinetics of the CO oxidation reaction on individual grains of a polycrystalline Pd foil was studied in situ by PEEM, MS and XPS. The silicon oxide formation induced by Si-impurity segregation at oxidizing conditions, was monitored by XPS and its impact on the global and local (spatially resolved) kinetics of the CO oxidation was determined by MS and PEEM. The results reveal a drastic inhibiting effect of silicon oxide on the Pd reactivity towards CO oxidation, manifested both in the collapse of the global CO2 formation rate and in the modified local reactive properties of individual Pd micrograins. The presence of adsorbed oxygen on the Pd surface effectively enhances the silicon segregation to the Pd surface.Graphical Abstract

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Section: Introductionmentioning

confidence: 99%

Silicon Oxide Surface Segregation in CO Oxidation on Pd: An in situ PEEM, MS and XPS Study

et al. 2013

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“…Pt-cerium oxide systems have been reported to be significantly active catalysts for CO oxidation [1], hydrogen production [2], oxidation of ethanol [3] and decomposition of methanol [4]. High activity for the water gas shift reaction was predicated on the presence of cationic platinum [5,6] in cerium oxide.…”

Section: Introductionmentioning

confidence: 99%

Pt and Sn Doped Sputtered CeO₂ Electrodes for Fuel Cell Applications

et al. 2010

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The interaction of Pt with CeO2 layers was investigated by using photoelectron spectroscopy. Thirty‐nanometre‐thick Pt and Sn doped CeO2 layers were deposited simultaneously by rf‐magnetron sputtering on a Si(001) substrate and a carbon diffusion layer of a polymer membrane fuel cell by using a composite CeO2–Pt–Sn target. The laboratory XPS and synchrotron radiation soft X‐ray and hard X‐ray photoemission spectra showed the formation of cerium oxide with completely ionised Pt2+,4+ species, and with Pt4+ embedded in the film bulk. Hydrogen/air fuel cell activity measurements normalised to the amount of Pt used revealed high specific power of up to 5.4 × 104 mW mg–1 (Pt). The activity of these materials is explained by the strong activity of embedded Ptn+ cations.

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“…This combination results in the influence of Pt on the adsorption of carbon monoxide, propane, and oxygen [13] which in turn leads to the improved activity of the platinum layer. This enhancement in the activity may be attributed to the enhanced O 2 dissociation rate at the Ti-Zr/Pt interface.…”

Section: Results and Discutionsmentioning

confidence: 99%

Temperature-independent TiO<inf>2</inf>-ZrO<inf>2</inf> oxygen lambda sensor

2008

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The electromotive force (EMF) of a new type of YSZ-based planar oxygen sensor exposed to simulated automobile exhaust gas, with no air reference, was measured under different conditions. A sensor with two parallel Pt electrodes, one coated with Ti 0 . 75 Zr 0 . 25 O 2 (Ti-Zr) as a solidstate reference, was fabricated. The performance of this sensor was measured at different temperatures and λs, i.e. the actual air/fuel ratio to that of stoichiometric value. The transition in EMF occurs around λ=1. Also the amplitude of the transition between rich (λ=0.8) and lean (λ=1.2) measured at a temperature range of 350-650 o C remains almost constant, indicating a temperature-independent performance.

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Ceria nanoformations in CO oxidation on Pt(111): Promotional effects and reversible redox behaviour

Cited by 31 publications

References 58 publications

Silicon Oxide Surface Segregation in CO Oxidation on Pd: An in situ PEEM, MS and XPS Study

Silicon Oxide Surface Segregation in CO Oxidation on Pd: An in situ PEEM, MS and XPS Study

Pt and Sn Doped Sputtered CeO₂ Electrodes for Fuel Cell Applications

Temperature-independent TiO<inf>2</inf>-ZrO<inf>2</inf> oxygen lambda sensor

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Ceria nanoformations in CO oxidation on Pt(111): Promotional effects and reversible redox behaviour

Cited by 31 publications

References 58 publications

Silicon Oxide Surface Segregation in CO Oxidation on Pd: An in situ PEEM, MS and XPS Study

Silicon Oxide Surface Segregation in CO Oxidation on Pd: An in situ PEEM, MS and XPS Study

Pt and Sn Doped Sputtered CeO2 Electrodes for Fuel Cell Applications

Temperature-independent TiO<inf>2</inf>-ZrO<inf>2</inf> oxygen lambda sensor

Contact Info

Product

Resources

About

Pt and Sn Doped Sputtered CeO₂ Electrodes for Fuel Cell Applications