کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
58974 1419432 2015 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Improving the efficiency of a direct ethanol fuel cell by a periodic load change
ترجمه فارسی عنوان
بهبود کارایی یک سلول سوختی اتانول مستقیم با تغییر بار دوره ای
کلمات کلیدی
الکترو اکسیداسیون اتانول، الکتروتالیز، سلول سوخت مستقیم اتانول، سلول سوختی غشای الکترولیتی پلیمر، پلاتین، پلاتین-روتنیم
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
چکیده انگلیسی

We present a simple method to increase the efficiency of a direct ethanol fuel cell by a periodic modulation of the load (pulsed mode). The fuel cell was periodically short circuited with a resistor (1 Ω) for a few seconds (high load period) followed by a low load period of up to 100 s when the resistor was disconnected. The open circuit voltage (OCV) values before and after the short circuit of the cell showed an increase of up to 70 mV. The higher OCV was due to the oxidation and removal of strongly adsorbed CO during the electric short circuit when the electric potential of the anode was increased to be close to the cathode potential. The depoisoned anode surface was much more active directly after the short circuit. The slow decrease of the OCV observed after the short circuit was caused by the subsequent poisoning of the anode surface, which can be neutralized by another short circuit. In general, a stable increase in cell performance was obtained by repetition of the electric short circuit. The data showed that the pulse mode gave an increase in the power generated by the direct ethanol fuel cell by up to 51% and was 6% on average. It is anticipated that this mode of operation can be used also in different types of polymer electrolyte membrane fuel cells where CO poisoning is a problem, and after optimization of the parameters, a much higher gain in efficiency can be obtained.

Graphical AbstractA very simple method of increasing direct ethanol fuel cell efficiency by over 50%, and cell voltage by up to 70 mV, using periodic modulation of the load (shorting with a resistor) is presented and discussed.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chinese Journal of Catalysis - Volume 36, Issue 4, April 2015, Pages 496–501
نویسندگان
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