کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9759239 | 1497701 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of geometric and electronic factors on ORR activity of carbon supported Pt-Co electrocatalysts in PEM fuel cells
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Effects of geometric and electronic factors on ORR activity of carbon supported Pt-Co electrocatalysts in PEM fuel cells Effects of geometric and electronic factors on ORR activity of carbon supported Pt-Co electrocatalysts in PEM fuel cells](/preview/png/9759239.png)
چکیده انگلیسی
The effects of both geometric (Pt-Pt bond distance) and electronic (Pt d-band vacancy) factors on the electrocatalytic activity for the oxygen reduction reaction (ORR) of carbon supported Pt and Pt-Co alloy catalysts were investigated by X-ray diffraction and X-ray absorption spectroscopies in conjunction with electrochemical measurements in proton exchange membrane (PEM) fuel cells. In the presence of cobalt, a decrease in the Pt-Pt bond distance and an increase in the metal particle size were observed. In PEM fuel cells the ORR activity on all the Pt-Co/C catalysts was higher than that on Pt/C. A poor fit between the ORR activity and the Pt-Pt bond distance was found. Conversely, the ORR activity presented a linear relationship with the integrated intensity of the Pt L3 edge at 1.1Â V, related to the Pt d-band vacancy. This is because this parameter takes into account both alloying (Pt-Pt bond distance) and particle size effects.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 30, Issue 11, September 2005, Pages 1213-1220
Journal: International Journal of Hydrogen Energy - Volume 30, Issue 11, September 2005, Pages 1213-1220
نویسندگان
E. Antolini, J.R.C. Salgado, M.J. Giz, E.R. Gonzalez,