کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1292484 | 973389 | 2006 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A methanol concentration sensor using twin membrane electrode assemblies operated in pulsed mode for DMFC
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A methanol concentration sensor based on twin Nafion membrane electrode assemblies (MEAs) was constructed and characterized by electrochemical methods. Pulsed amperometric detection (PAD) method, using a low frequency (67Â mHz) potential waveform of Ered (cathodic activation potential)Â =Â â0.2Â V, Epre-oxd (anodic pre-oxidation potential)Â =Â +0.60Â V and Edet (detection potential)Â =Â +0.80Â V versus DHE with the same pulse width of 5Â s was applied to the sensor to enhance its performance. The response in pulsed mode had better linearity over a wider concentration range than that in potentiostatic mode. Furthermore, using this PAD method, the stability of the sensor was enhanced significantly with a slightly linear degradation rate of 2.9Â mAÂ hâ1 during long-time test. The performances of the sensor in terms of linearity, low anodic saturation and high stability show its potential application for direct methanol fuel cells.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 162, Issue 2, 22 November 2006, Pages 1115-1121
Journal: Journal of Power Sources - Volume 162, Issue 2, 22 November 2006, Pages 1115-1121
نویسندگان
Wei Sun, Gongquan Sun, Weiqian Yang, Shaohua Yang, Qin Xin,