Anodic silver (II) oxides investigated by combined electrochemistry, ex situ XPS and in situ X-ray absorption spectroscopy
| Autor: | Hans-Henning Strehblow, Dirk Lützenkirchen-Hecht |
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| Rok vydání: | 2009 |
| Předmět: |
X-ray absorption spectroscopy
Absorption spectroscopy Extended X-ray absorption fine structure Anodizing Inorganic chemistry Oxide Analytical chemistry Surfaces and Interfaces General Chemistry Condensed Matter Physics Electrochemistry Surfaces Coatings and Films chemistry.chemical_compound chemistry X-ray photoelectron spectroscopy Materials Chemistry Silver oxide |
| Zdroj: | Surface and Interface Analysis. 41:820-829 |
| ISSN: | 0142-2421 |
| DOI: | 10.1002/sia.3106 |
| Popis: | Silver (II) oxide layers (AgO) were prepared by anodic oxidation of pre-oxidized, Ag2O-covered silver electrodes in 1 M NaOH (pH 13.8). The oxidized electrodes were investigated using a combination of electrochemical techniques, ex situ X-ray photoelectron spectroscopy (XPS) and in situ surface-sensitive grazing incidence X-ray absorption spectroscopy (EXAFS) under full potential control. The application of these different techniques leads to a detailed, consistent picture of the anodic silver (II) oxide layer formation. The experiments have shown that the chemical composition of the AgO layer varies significantly with oxidation potential, revealing a decreasing oxygen deficiency with increasing anodization potential and oxidation time. XPS as well as EXAFS experiments support the interpretation of the oxide as a mixed valence Ag+Ag3+O2 with different contributions of Ag+ and Ag3+ species, depending on potential and anodization time. Copyright © 2009 John Wiley & Sons, Ltd. |
| Databáze: | OpenAIRE |
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