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  Exposure of Oxidized Copper Surfaces to Aqueous Na2S Solution Studied with Soft X-Ray Spectroscopy

Hollmark, H. M., Vegelius, J. R., Kristiansen, P. T., Werme, L., & Duda, L. C. (2011). Exposure of Oxidized Copper Surfaces to Aqueous Na2S Solution Studied with Soft X-Ray Spectroscopy. Journal of the Electrochemical Society, 158(1), C1-C5. doi:10.1149/1.3504891.

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Hollmark, H. M.1, Autor
Vegelius, J. R.1, Autor
Kristiansen, Paw Toldbad1, 2, Autor           
Werme, L.1, Autor
Duda, L. C.1, Autor
Affiliations:
1Department of Physics and Astronomy, Division of Molecular and Condensed Matter Physics, Uppsala University, Uppsala, SE-751 20 Sweden , ou_persistent22              
2Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              

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Schlagwörter: copper; oxidation; rough surfaces; scanning electron microscopy; sodium compounds; surface texture; X-ray absorption spectra; X-ray scattering
 Zusammenfassung: We present results from X-ray absorption spectroscopy (XAS) and resonant inelastic X-ray scattering (RIXS) of oxidized polycrystalline copper surfaces [Cu(I) and Cu(II), respectively] exposed to a 1.0 mM aqueous solution of Na2S (sodium sulfide) for several hours. Scanning electron microscopy reveals that the Cu oxide surfaces attain a much rougher texture upon sodium sulfide exposure, and that the exposed Cu(II) oxide sample exhibits areas with crystallites. The XAS spectra show that sodium sulfide effectively reduces Cu(II) oxide to Cu(I) compounds. The RIXS spectra of the exposed surfaces closely resemble those of the Cu2O reference sample with the notable exception of their Cu LIII,II-RIXS spectra. We conclude that copper evidently forms a Cu(I) compound with oxygen but with a Cu 3d-band of much reduced width, pointing to the possibility of a more complex compound containing both oxygen and sulfur.

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Sprache(n): eng - English
 Datum: 2010-11-092011
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1149/1.3504891
 Art des Abschluß: -

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Titel: Journal of the Electrochemical Society
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: New York, NY : Electrochemical Society
Seiten: - Band / Heft: 158 (1) Artikelnummer: - Start- / Endseite: C1 - C5 Identifikator: ISSN: 0013-4651
CoNE: https://pure.mpg.de/cone/journals/resource/991042748197686