کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6615292 | 459626 | 2013 | 26 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Nafion thickness dependence of H2O2 yield during O2 reduction at Nafion/Pt microelectrode studied by scanning electrochemical microscopy
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
During the O2 reduction reaction (ORR) at the Pt cathode of a polymer electrolyte fuel cell (PEFC), a slight amount of H2O2 is produced as a by-product. The generated H2O2 degrades the polymer electrolyte membrane and Pt electrode due to its corrosive nature. It is reported that a relationship exists between the amount of H2O2 and an amount of ionomer used in an electrocatalyst layer. To clarify the relationship, we employed a Pt microdisk electrode so that the Nafion-coated thickness could be uniformly controlled. The H2O2 amount was then investigated with respect to the overcoated Nafion thickness. The generated H2O2 at the Nafion-coated Pt generator during the ORR is oxidized at a Pt detector of the scanning electrochemical microscope. As a result, the H2O2 detection current increased with the increasing Nafion thickness up to 0.16 μm. The current then decreased in the thicker Nafion region. The H2O2 increase at the thin Nafion/Pt can be explained by a decrease in the number of Pt-Pt pair-sites for the ORR. For the H2O2 decrease in the thicker region, a low diffusion coefficient of H2O2 in the Nafion layer makes it difficult to spread out.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 113, 15 December 2013, Pages 773-778
Journal: Electrochimica Acta - Volume 113, 15 December 2013, Pages 773-778
نویسندگان
Sayoko Shironita, Tsukasa Sakai, Minoru Umeda,