Field Desorption Pathways of Water During the H2- Oxidation on a Pt Field Emitter Full article
Conference |
43rd International Field Emission Symposium 14-19 Jul 1996 , Moscow |
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Journal |
Journal De Physique IV : JP
ISSN: 1155-4339 |
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Output data | Year: 1996, Volume: 6, Number: C5, Pages: 31-36 Pages count : 6 DOI: 10.1051/jp4:1996504 | ||||
Tags | HYDROGEN OXYGEN REACTION; ION MICROSCOPE; PLATINUM; KINETICS; Pt(111) | ||||
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Abstract:
Using the field ion microscope as a flow reactor the catalytic oxidation of hydrogen by O2 on Pt has been studied by the ToF coincidence technique. The "imaging ions" consist mainly of H3O+. less H2O+ and to some extent field and coverage sensitive O2+ species. The production spectrum qualitatively coincides with that of pure water field desorbed at 300 K. On the oxygen side of the H2/O2/Pt system, H3O+ is formed by the field induced disproportionation of two water molecules leaving behind an OHad. For the system H2/O2/Pt, the observed emission of O2+ during field ionisation is striking in so far as Oad recombination at 300 K is improbable. To clarify the nature of the precursor of this reaction channel a coincidence experiment was performed and a simultaneous emission of O2+and H3O+ ions from the same site was detected. We propose the following d'isproportionation for this step: a hydroxyl forms a transition complex with a peroxy-surface species, which then desintegrates into molecular oxygen and hydronium, which emit as O2+ and H3O+ in the field. During the ongoing hydrogen oxidation this coincidence is also observed on the oxygen side of the reaction; on the hydrogen side of the reaction no coincidence is observed, as in this case the pathway Had + H2O+ad→H3O+ is predominant.
Cite:
Drachsel W.
, Wesseling C.
, Gorodetskii V.
Field Desorption Pathways of Water During the H2- Oxidation on a Pt Field Emitter
Journal De Physique IV : JP. 1996. V.6. NC5. P.31-36. DOI: 10.1051/jp4:1996504 WOS Scopus РИНЦ
Field Desorption Pathways of Water During the H2- Oxidation on a Pt Field Emitter
Journal De Physique IV : JP. 1996. V.6. NC5. P.31-36. DOI: 10.1051/jp4:1996504 WOS Scopus РИНЦ
Files:
Full text from publisher
Dates:
Submitted: | Jan 1, 1996 |
Published print: | Sep 1, 1996 |
Identifiers:
Web of science | WOS:A1996WF80000007 |
Scopus | 2-s2.0-0030235769 |
Elibrary | 15019252 |
Chemical Abstracts | 1997:149874 |
Chemical Abstracts (print) | 126:162795 |
OpenAlex | W2035478814 |