کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1297017 1498381 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electroactivity of Pt–Ru/polyaniline composite catalyst-electrodes prepared by electrochemical deposition methods
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Electroactivity of Pt–Ru/polyaniline composite catalyst-electrodes prepared by electrochemical deposition methods
چکیده انگلیسی

The electrochemical deposition of Pt–Ru nanoparticles on conducting polymer supports and carbon supports, as well as their electro-catalytic activities, were investigated. Pt–Ru catalysts of 3–8 nm average size were grown on supports by step-potential plating methods. The catalysts' loading contents were enhanced by increasing the plating time of the deposition method. Polyaniline and carbon blacks (CBs) were selected and compared as catalyst supports. The particle sizes and morphological structures of the Pt–Ru/support catalysts were evaluated using X-ray diffraction (XRD) and transmission electron microscopy (TEM). The electrochemical behaviors of the Pt–Ru/support catalysts for methanol oxidation were investigated according to their characteristic current-voltage curves and chronoamperometry in a methanol solution. As a result, the electrochemical activity was enhanced with increased plating time, reaching the maximum at 24 min, and then decreased. The specific current density for the polyaniline-supported catalysts was higher than that for the CBs-supported ones. The enhanced catalytic activity was related to the higher electrical conductivity of the polyaniline, the increased electrochemical surface area of catalysts, or the higher ion diffusion behaviours.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 178, Issues 37–38, 29 February 2008, Pages 1915–1921
نویسندگان
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