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XPS Observation of OH Groups Incorporated in an Ag(111) Electrode Научная публикация

Общее Язык: Английский, Жанр: Статья (Full article),
Статус опубликования: Опубликована, Оригинальность: Оригинальная
Журнал Surface Science
ISSN: 0039-6028
Вых. Данные Год: 1998, Том: 418, Номер: 2, Страницы: 441-456 Страниц : 16 DOI: 10.1016/S0039-6028(98)00728-6
Ключевые слова Ag(111), Electrochemistry, Low index single crystal surface, Metal-electrolyte interface, OH groups, Silver, X-ray photoelectron spectroscopy
Авторы Zemlyanov D.Y. 1 , Savinova E. 1 , Scheybal A. 2 , Doblhofer K. 2 , Schlögl R. 2
Организации
1 Boreskov Institute of Catalysis, Pr. Ak. Lavrentieva, 5, 630090 Novosibirsk, Russia
2 Fritz-Haber-Institut der Max-Planck Gesellschaft, Faradayweg 4–6, D-14195, Berlin, Germany

Информация о финансировании (2)

1 Max Planck Society
2 Alfred Toepfer Stiftung F.V.S.

Реферат: An Ag(111) single crystal electrode emersed from NaF+NaOH electrolyte (pH 11) under anodic polarisation has been studied ex situ by means of X-ray photoelectron spectroscopy (XPS). “Underpotential” oxidation has been found at +0.2 and 0.0 V vs. Hg/HgO, that is by 0.2–0.4 V more negative than the reversible potential of the Ag2O phase formation. The generation of a number of surface and bulk oxygen-containing species, including surface Ag2O-like species, surface and bulk OH groups (OHads and OHbulk, respectively), surface and bulk atomic oxygen, has been observed on the emersed electrode. The present work provides the first direct evidence of the hydroxide incorporation in the bulk of an Ag(111) electrode in the course of underpotential oxidation. OHbulk is characterised by a O 1s peak at approximately 532.8 eV, while surface OHads manifests itself as the peak at ca. 531.6 eV. The origin of the positive binding energy shift is discussed. Surface and bulk OH groups demonstrate substantially different thermal stability. Surface species desorb below 470 K, while dissolved OH groups exhibit high stability towards prolonged annealing in vacuum at temperatures up to 750 K; they remain in the near-surface region even after sputtering by Ar+ and He+ ions. The oxide-like species is characterised by the O 1s peak at 529.5 eV and decomposes after heating in vacuum at a temperature of about 470 K. The He(I) and He(II) UP spectra of the emersed electrode along with the XPS data provide evidence that the coverage with surface oxide is less than 1 ML. A tentative scheme of Ag(111) underpotential oxidation is discussed.
Библиографическая ссылка: Zemlyanov D.Y. , Savinova E. , Scheybal A. , Doblhofer K. , Schlögl R.
XPS Observation of OH Groups Incorporated in an Ag(111) Electrode
Surface Science. 1998. V.418. N2. P.441-456. DOI: 10.1016/S0039-6028(98)00728-6 WOS Scopus РИНЦ
Даты:
Поступила в редакцию: 12 февр. 1998 г.
Принята к публикации: 11 сент. 1998 г.
Опубликована в печати: 5 дек. 1998 г.
Опубликована online: 9 дек. 1998 г.
Идентификаторы:
Web of science WOS:000077857400014
Scopus 2-s2.0-0032488145
РИНЦ 13299094
Chemical Abstracts 1999:50745
Chemical Abstracts (print) 130:174346
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