کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6691285 | 501909 | 2014 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Improvement on performance and efficiency of direct methanol fuel cells using hydrocarbon-based membrane electrode assembly
ترجمه فارسی عنوان
بهبود عملکرد و کارایی سلول های سوخت مستقیم متانول با استفاده از مجموعه الکترودهای غشایی مبتنی بر هیدروکربن
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کلمات کلیدی
سلول سوخت مستقیم متانول، تعادل توده، کارایی فرادید، غشاء بر اساس هیدروکربن، ضریب انتقال آب
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
مهندسی انرژی و فناوری های برق
چکیده انگلیسی
In order to improve the energy efficiency (fuel efficiency and electrical power) of direct methanol fuel cells (DMFCs), the hydrocarbon (HC) membrane-based membrane electrode assemblies (MEAs) are investigated under various operating conditions. The MEAs are then compared with the conventional Nafion-based MEA in terms of their efficiency and performance. The Faradaic efficiency and water transfer coefficient (WTC) are calculated based on mass balance measurements. The Faradaic efficiency of the HC-based MEAs is improved over the Nafion-based MEAs since methanol crossover decreased. The performance of HC-based MEAs shows strong dependency on the anode stoichiometry at high current densities probably because of the limited mass transport of fuel, which is not observed for the Nafion-based MEAs. The Nafion-based MEAs show a WTC of 3, whereas the HC-based MEAs show a very low WTC of â2, indicating the back-diffusion of water from the cathode to the anode. This may have limited mass transport by interrupting proton conduction at high current densities. The performance of HC-based MEAs at high current densities is improved as the fuel stoichiometry increases; High Faradaic efficiency is maintained by decreasing the cathode stoichiometry.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Energy - Volume 115, 15 February 2014, Pages 95-102
Journal: Applied Energy - Volume 115, 15 February 2014, Pages 95-102
نویسندگان
Joon-Hee Kim, Min-Jee Yang, Jun-Young Park,