کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7729804 1497931 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Quantitative study of ruthenium cross-over in direct methanol fuel cells during early operation hours
ترجمه فارسی عنوان
مطالعه کمی از روتنیم عبور در سلول های سوخت مستقیم متانول در ساعات کار زودهنگام
کلمات کلیدی
روتنیم عبور می کند، سلول سوخت مستقیم متانول، عملیات اولیه، طیف سنجی فلورسانس اشعه ایکس، طیف سنجی جرمی پلاسما به صورت القایی،
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
چکیده انگلیسی
In direct methanol fuel cells (DMFC), ruthenium cross-over is an important degradation phenomenon. The loss of ruthenium from the anode, its transport through the membrane and its deposition onto the cathode are detrimental to the fuel cell performance and limit the fuel cell's lifetime. Here we present a quantitative study on the fraction of ruthenium being transferred from the anode to the cathode during early operation hours (0-100 h) of a DMFC. Already during fabrication of the MEA ruthenium is transferred to the cathode. In our pristine MEAs about 0.024 wt% Ru could be found in the cathode catalyst. The cell potential during operation seems to have only a minor influence on the dissolution process. In contrast, the operation time appears to be much more important. Our data hint at two dissolution processes: a fast process dominating the first hours of operation and a slower process, which is responsible for the ongoing ruthenium transfer during the fuel cell lifetime. After 2 h held at open circuit conditions the Ru content of the cathode side was 10 times higher than in the pristine MEA. In contrast, the slower process increased that amount only by a factor of two over the course of another 100 h.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 301, 1 January 2016, Pages 210-218
نویسندگان
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