کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
639671 | 1456201 | 2006 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Halide diffusion in polyaniline membranes
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The feasibility of application of polyaniline (PAni) as electrolyte in polymer-electrolyte-membrane fuel cells (PEMFC) was investigated. PAni was dissolved in N-methyl pyrrolidone (NMP), cast as emeraldine base membranes (EB) and then doped with halide acids. The proton conductivity was measured according to Hittorf. The chloride ion distribution within the membrane was evaluated using energy-dispersive-X-ray analysis (EDX) and the diffusion coefficient was calculated using EDX, impedance spectroscopy and photometric analysis. The specific resistance was determined using conventional four-point measurement. The proton conductivity of HClconc.-doped PAni is approximately half that of the reference material Nafion®117. The diffusion coefficient for the chloride ion within the membrane was determined to be between 1.86 and 3.4Â ÃÂ 10â8Â cm2Â sâ1. Although halide-doped membranes were found to be proton conducting, slow halide removal during fuel cell operation occurred causing a rapid decline in cell performance. It is, therefore, concluded that in order to prepare suitable PAni membranes for fuel cell applications, it will be necessary to dope PAni with acids in such a way that loss of the dopant can not occur. Doping with solid acids or large molecular acids (in order to reduce their diffusivity) may be a solution to the problem.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 270, Issues 1â2, 15 February 2006, Pages 115-122
Journal: Journal of Membrane Science - Volume 270, Issues 1â2, 15 February 2006, Pages 115-122
نویسندگان
F. Treptow, A. Jungbauer, K. Hellgardt,