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Co-Adsorption of Fluoride and Hydroxide Ions on Ag(111) in Alkaline Electrolytes: Electrochemical and SHG Studies Научная публикация

Общее Язык: Английский, Жанр: Статья (Full article),
Статус опубликования: Опубликована, Оригинальность: Оригинальная
Журнал Zeitschrift fur Physikalische Chemie-International Journal of Research in Physical Chemistry and Chemical Physics
ISSN: 0942-9352 , E-ISSN: 2196-7156
Вых. Данные Год: 2003, Том: 217, Страницы: 557-572 Страниц : 16 DOI: 10.1524/zpch.217.5.557.20458
Ключевые слова Ag(111), Alkaline Electrolyte, Co-adsorption, Fluoride, Hydroxide, Second Harmonic Generation (SHG), Surface Oxide
Авторы Danckwerts M. 1 , Savinova E.R. 1,2,3 , Horswell S. 1 , Pettinger B. 1 , Doblhofer K. 1
Организации
1 Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4–6, 14195 Berlin, Germany
2 Boreskov Institute of Catalysis, Russian Academy of Sciences, Pr. Akademika Lavrentieva 5, 630090 Novosibirsk, Russian Federation
3 Technische Universität München, Physik-Department E19, James-Franck-Str. 1, 85748 Garching, Germany

Информация о финансировании (1)

1 Max Planck Society

Реферат: Hydroxide (OH−) adsorption at Ag(111)/alkaline electrolyte interfaces is the initial step leading to the formation of surface oxide. We investigate how OH− anion adsorption is influenced by co-adsorption of supporting electrolyte anions (F−). Pure NaF and NaOH as well as mixed electrolytes ranging from pH = 5.8 to 14 are investigated. The rotational anisotropy of the second harmonic generation (SHG) signal is measured to distinguish adsorptive processes from structural changes on the Ag surface. Our results clearly show a cross-over from F−-dominated to OH−-dominated adsorption, while both species remain charged upon adsorption. At more positive potentials, but below the reversible potential of bulk oxide growth, OH is discharged leading to sub-monolayer oxide build-up, whereas in acidic electrolyte, Ag is dissolved. At intermediate pH, the formation of a structured OH−/F− co-adsorbed layer is proposed.
Библиографическая ссылка: Danckwerts M. , Savinova E.R. , Horswell S. , Pettinger B. , Doblhofer K.
Co-Adsorption of Fluoride and Hydroxide Ions on Ag(111) in Alkaline Electrolytes: Electrochemical and SHG Studies
Zeitschrift fur Physikalische Chemie-International Journal of Research in Physical Chemistry and Chemical Physics. 2003. V.217. P.557-572. DOI: 10.1524/zpch.217.5.557.20458 WOS Scopus РИНЦ
Даты:
Поступила в редакцию: 21 окт. 2002 г.
Опубликована online: 22 дек. 2002 г.
Опубликована в печати: 1 мая 2003 г.
Идентификаторы:
Web of science WOS:000182884100008
Scopus 2-s2.0-0038292981
РИНЦ 13428708
Chemical Abstracts 2003:474759
Chemical Abstracts (print) 139:187316
Альметрики: