کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1289349 973297 2010 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Stable support based on highly graphitic carbon xerogel for proton exchange membrane fuel cells
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Stable support based on highly graphitic carbon xerogel for proton exchange membrane fuel cells
چکیده انگلیسی

Highly graphitic carbon xerogel (GCX) is prepared by the modified sol–gel polymerization process using cobalt nitrate as the catalyst, followed by high temperature treatment at 1800 °C. The as-prepared GCX is explored as a stable support for Pt in proton exchange membrane fuel cells. The results of N2 sorption measurement and X-ray diffraction analysis (XRD) reveal that GCX has a better mesoporous structure and a preferably higher degree of graphitization, compared with the commercial XC-72 carbon black. The transmission electron microscopy (TEM) image indicates that Pt nanoparticles are well dispersed on GCX and exhibit relatively narrow size distribution. Accelerated aging test (AAT) based on potential cycling is used to investigate the durability of the as-prepared Pt/GCX in comparison with the commercial Pt/C. Electrochemical analysis demonstrates that the catalyst with GCX as a support exhibits an alleviated degradation rate of electrochemical active surface area (39% for Pt/GCX and 53% for Pt/C). The results of single cell durability tests indicate that the voltage loss of Pt/GCX at 100 mA cm−2 is about 50% lower than that of Pt/C. GCX is expected to be a corrosion resistant electrocatalyst support.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 195, Issue 19, 1 October 2010, Pages 6323–6328
نویسندگان
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