Co-Adsorption of Fluoride and Hydroxide Ions on Ag(111) in Alkaline Electrolytes: Electrochemical and SHG Studies Full article
Journal |
Zeitschrift fur Physikalische Chemie-International Journal of Research in Physical Chemistry and Chemical Physics
ISSN: 0942-9352 , E-ISSN: 2196-7156 |
||||||
---|---|---|---|---|---|---|---|
Output data | Year: 2003, Volume: 217, Pages: 557-572 Pages count : 16 DOI: 10.1524/zpch.217.5.557.20458 | ||||||
Tags | Ag(111), Alkaline Electrolyte, Co-adsorption, Fluoride, Hydroxide, Second Harmonic Generation (SHG), Surface Oxide | ||||||
Authors |
|
||||||
Affiliations |
|
Funding (1)
1 | Max Planck Society |
Abstract:
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.
Cite:
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
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
Dates:
Submitted: | Oct 21, 2002 |
Published online: | Dec 22, 2002 |
Published print: | May 1, 2003 |
Identifiers:
Web of science | WOS:000182884100008 |
Scopus | 2-s2.0-0038292981 |
Elibrary | 13428708 |
Chemical Abstracts | 2003:474759 |
Chemical Abstracts (print) | 139:187316 |
OpenAlex | W1973997369 |