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On the Mechanism of Ag(111) sub-Monolayer Oxidation: A Combined Electrochemical, in situ SERS and ex situ XPS Study Научная публикация

Журнал Electrochimica Acta
ISSN: 0013-4686
Вых. Данные Год: 2000, Том: 46, Номер: 2-3, Страницы: 175-183 Страниц : 9 DOI: 10.1016/S0013-4686(00)00571-5
Авторы Savinova E.R. 1 , Zemlyanov D.Y. 2 , Pettinger B. 3 , Scheybal A. 3 , Schlögl R. 3 , Doblhofer K. 3
Организации
1 Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
2 Boreskov Institute of Catalysis, Russian Academy of Sciences, Pr. Akademika Lavrentieva 5, 630090 Novosibirsk, Russia
3 Worcester Polytechnic Institute, Department of Chemical Engineering, 100 Institute Road, Worcester, MA 01609, USA
Реферат: In the present work in situ surface enhanced Raman spectroscopy (SERS), ex situ X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS) are used to study the interface between a Ag(111) electrode and an alkaline electrolyte. Formation of a number of potential-dependent adsorbates is observed above the point of zero charge (Epzc) of the Ag electrode. These are: OH groups (OHadsγ−) and oxide-like species (Oadsδ−). Electrochemisorbed hydroxide species show by the appearance of Raman bands at 540–560 cm−1 and at 803–819 cm−1, attributed to Ag–OH stretching and AgO–H bending vibrations respectively. Strong isotope shift of the Raman bands towards lower frequencies is observed in D2O solutions, proving their assignment. The Oadsδ− and OHadsγ− species are characterised by the O 1s peaks at ca. 529.5 and 531.6, respectively. Formation of the above-mentioned species is verified also by the UP spectra of the emersed electrodes, showing the bands at 3.0 eV typical for the oxide-like adsorbates and 9.0 and 11.1 eV for hydroxo-groups. The OHadsγ− and Oadsδ− species are negatively charged, as evidenced by the adsorption of Na+ on the Ag electrode positive to the Epzc. A mechanism of the Ag(111) sub-monolayer oxidation is suggested on the basis of combined evidence from cyclic voltammetry, in situ SERS, ex situ XPS and UPS.
Библиографическая ссылка: Savinova E.R. , Zemlyanov D.Y. , Pettinger B. , Scheybal A. , Schlögl R. , Doblhofer K.
On the Mechanism of Ag(111) sub-Monolayer Oxidation: A Combined Electrochemical, in situ SERS and ex situ XPS Study
Electrochimica Acta. 2000. V.46. N2-3. P.175-183. DOI: 10.1016/S0013-4686(00)00571-5 WOS Scopus РИНЦ CAPlusCA OpenAlex Sciact
Даты:
Поступила в редакцию: 26 нояб. 1999 г.
Опубликована в печати: 1 нояб. 2000 г.
Опубликована online: 8 дек. 2000 г.
Идентификаторы БД:
Web of science: WOS:000165912600004
Scopus: 2-s2.0-0034318026
РИНЦ: 13336854
Chemical Abstracts: 2000:870543
Chemical Abstracts (print): 134:154403
OpenAlex: W2048703643
Sciact: 7534
Цитирование в БД:
БД Цитирований
Scopus 68
OpenAlex 66
Альметрики: