کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10276295 | 463424 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Studies of CO tolerance on modified gas diffusion electrodes containing ruthenium dispersed on carbon
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Studies of the CO tolerance for the hydrogen oxidation reaction (hor) on a polymer electrolyte fuel cell were conducted on modified gas diffusion electrodes with CO filtering layers formed by ruthenium dispersed onto carbon (Ru/C) and having platinum dispersed on carbon (Pt/C) in the catalyst layer. Different configurations for gas diffusion electrodes containing Ru hydrated-oxide (RuOxHy/C) layers were tested in order to understand the CO oxidation mechanism on these catalysts. Single cell polarization results indicated that a direct contact between Ru distributed on the diffusion layer and the catalyst layer is required to achieve CO tolerance. Results also show that an enhanced activity is achieved for the hor in the presence of CO with PtRu/C in the catalyst layer obtained by an impregnation method. Also, an electrode formed by a RuOxHy/C filtering layer in contact with a catalyst layer with PtRu/C showed the highest CO-tolerance. For this system, the cell voltage loss was only 65 mV at 1 AÂ cmâ2 with H2Â +Â 100 ppm CO, with respect to the value obtained with pure hydrogen.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electroanalytical Chemistry - Volume 575, Issue 1, 15 January 2005, Pages 53-60
Journal: Journal of Electroanalytical Chemistry - Volume 575, Issue 1, 15 January 2005, Pages 53-60
نویسندگان
Elisabete I. Santiago, Valdecir A. Paganin, Marcelo do Carmo, Ernesto R. Gonzalez, Edson A. Ticianelli,