Isothermal Oscillations of the Hydrogen-Oxidation Reaction on Platinum: Investigations in the Field Electron and Field Ion Microscope Научная публикация
Журнал |
Applied Surface Science
ISSN: 0169-4332 |
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Вых. Данные | Год: 1994, Том: 76-77, Номер: 1-4, Страницы: 129-135 Страниц : 7 DOI: 10.1016/0169-4332(94)90333-6 | ||||
Ключевые слова | SURFACES; BEHAVIOR; KINETICS | ||||
Авторы |
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Организации |
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Информация о финансировании (1)
1 | Max Planck Society |
Реферат:
During the reaction of H2 + 12 O2 → H2O on a platinum field emitter at 300 <T<400 K, pH2 = 5×10-7 to 5 × 10-4 mbar and pO2 = 3 × 10-5 to 6 × 10-4 mbar, three different adsorption phases can be distinguished in-situ via FEM and FIM. In FEM the different local work functions lead to areas of differing brightness, i.e. an Oad-covered surface with high work function appears black and a Had-covered surface with lower work function bright. In FIM, oxygen acts as the imaging gas (O+2 ions) of the Oad-covered surface areas and even brighter images are formed by the product water, thus identifying active sites of the reaction. At steady-state conditions the adsorption of hydrogen appears in the form of islands with 30 to 50 Å diameter black areas. The oscillating H2/O2 reaction follows a Langmuir-Hinshelwood mechanism. The Oad-covered surface starts at the {111} planes ({331} terraces) and proceeds in an anisotropic reaction sequence of planes until finally the (001) plane is covered by hydrogen. This Had layer at the Pt(001) surface is transferred into the Oad layer by a reaction front traveling in the reverse direction, starting from the central Pt(001) and propagating to the peripheral {111} planes.
Библиографическая ссылка:
Gorodetskii V.
, Block J.H.
, Drachsel W.
Isothermal Oscillations of the Hydrogen-Oxidation Reaction on Platinum: Investigations in the Field Electron and Field Ion Microscope
Applied Surface Science. 1994. V.76-77. N1-4. P.129-135. DOI: 10.1016/0169-4332(94)90333-6 WOS Scopus РИНЦ
Isothermal Oscillations of the Hydrogen-Oxidation Reaction on Platinum: Investigations in the Field Electron and Field Ion Microscope
Applied Surface Science. 1994. V.76-77. N1-4. P.129-135. DOI: 10.1016/0169-4332(94)90333-6 WOS Scopus РИНЦ
Даты:
Поступила в редакцию: | 2 авг. 1993 г. |
Принята к публикации: | 20 сент. 1993 г. |
Опубликована в печати: | 2 мар. 1994 г. |
Опубликована online: | 10 окт. 2002 г. |
Идентификаторы БД:
Web of science | WOS:A1994ND58700023 |
Scopus | 2-s2.0-0028383205 |
РИНЦ | 31116230 |
Chemical Abstracts | 1994:287084 |
Chemical Abstracts (print) | 120:287084 |
OpenAlex | W2083444462 |