کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9760499 | 1498050 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Preparation of platinum electrocatalysts using carbon supports for oxygen reduction at a gas-diffusion electrode
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Preparation of platinum electrocatalysts using carbon supports for oxygen reduction at a gas-diffusion electrode Preparation of platinum electrocatalysts using carbon supports for oxygen reduction at a gas-diffusion electrode](/preview/png/9760499.png)
چکیده انگلیسی
Platinum on carbon is the most popular electrocatalyst for oxygen reduction in acid fuel cells. In this study electrocatalysts based on six types of carbon substrate are prepared according to American Society for Testing and Materials (ASTM) standards. The electrocatalysts are made either by a direct method, in which sodium formate is used as a reducing agent, or by an indirect method, in which PtO2/C is treated under four different conditions. A platinum loading of 0.5 mg cmâ2 is used in all cases. The effects of the type of carbon support and the method of preparation of the electrocatalyst are investigated by electrochemical techniques, X-ray diffraction, scanning electron microscopy and N2 adsorption. The combination of substrate type and preparation procedure that gives electrodes with the best performance is direct reduction using sodium formate as a reductant and sample N339 as a carbon substrate. For this optimum electrocatalyst, the symmetry factor and exchange current density are 0.5279 and 95.6 mA cmâ2 in the rate-determining step, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 139, Issues 1â2, 4 January 2005, Pages 61-66
Journal: Journal of Power Sources - Volume 139, Issues 1â2, 4 January 2005, Pages 61-66
نویسندگان
Hussien Gharibi, Rasol Abdullah Mirzaie, Elias Shams, Mohammad Zhiani, Mehdi Khairmand,