کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
62155 47624 2010 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Promotion by hydrous ruthenium oxide of platinum for methanol electro-oxidation
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Promotion by hydrous ruthenium oxide of platinum for methanol electro-oxidation
چکیده انگلیسی

Pt–(RuOxHy)m electrocatalysts (m being the atomic Ru/Pt ratio) supported on multi-walled carbon nanotubes, in which amorphous hydrous ruthenium oxide (RuOxHy) is the exclusive Ru-containing species, were prepared and comprehensively characterized by X-ray diffraction, X-ray photoelectron spectroscopy, temperature-programmed reduction, thermogravimetric analysis and transmission electron microscopy techniques. Cyclic voltammetry (CV) and chronoamperometry studies of CO stripping and methanol electro-oxidation indicated that the CO tolerance and catalytic activity of Pt improved remarkably by the co-presence of RuOxHy. Repeated CV pretreatments in 0.5 M H2SO4 up to potentials higher than 0.46 V (vs. SCE) induced significant dissolution of RuOxHy, which changed the RuOxHy content, Pt–RuOxHy proximity and surface structure of Pt, and consequently altered the electrocatalytic activity of Pt in the final electrode. However, RuOxHy dissolution was not identified when the pretreatment potentials was set no higher than 0.46 V. Discussion on the promotional function of RuOxHy was made based on the peculiarity of RuOxHy as a mixed electron/proton conductor.

Amorphous hydrous ruthenium oxide (RuOxHy) alone is identified as an efficient promoter of Pt for the electro-oxidation of CO and methanol. However, its dissolution at potentials higher than 0.46 V (vs. SCE) would induce changes in Pt–RuOxHy proximity and even surface structure of Pt and thus alter the activity of Pt in electrocatalysis.Figure optionsDownload high-quality image (96 K)Download as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 275, Issue 1, 30 September 2010, Pages 34–44
نویسندگان
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