کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5424694 | 1395833 | 2008 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Surface characterization of ordered intermetallic PtBi(0Â 0Â 1) surfaces by ultra-high vacuum-electrochemistry (UHV-EC)
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
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چکیده انگلیسی
Surface preparation and characterization of an ordered intermetallic PtBi(0Â 0Â 1) single crystal was performed by a combination of surface-sensitive electron spectroscopic techniques under ultra-high vacuum (UHV) conditions and conventional electrochemistry (EC). The atomic concentration of the clean surface was estimated (quantitative Auger analysis) as 54Â at% Pt and 46Â at% Bi; the LEED pattern exhibited a (1Â ÃÂ 1) structure. These results are in good agreement with expectations for a Pt-terminated PtBi(0Â 0Â 1) crystal surface. The electrochemical studies of the clean, well-ordered and smooth PtBi(0Â 0Â 1) single crystal were carried out in an H2SO4 supporting electrolyte and indicated that the electrode surface is Pt-terminated with a behavior similar to that of a pure Pt electrode. However, the intermetallic phase was found to be more prone to surface oxidation in the studied potential window (â0.30Â V to +1.25Â V vs. Ag/AgCl (sat'd NaCl)). Chemisorption of SO42-/HSO4- species was observed at potentials positive of the open circuit potential (OCP). Cycling in a supporting electrolyte gave rise to roughening of the electrode surface. This change is due to the presence of the chemisorbed species on the electrode surface.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 602, Issue 10, 15 May 2008, Pages 1830-1836
Journal: Surface Science - Volume 602, Issue 10, 15 May 2008, Pages 1830-1836
نویسندگان
Jean Sanabria-Chinchilla, Hideki Abe, Francis J. DiSalvo, Héctor D. Abruña,