کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7720957 1497506 2014 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of variation of hydrophobicity of anode diffusion media along the through-plane direction in direct methanol fuel cells
ترجمه فارسی عنوان
اثر تغییر هیدروفوبیت رسانه انتشار انود در طول مسیر هواپیما در سلول های سوخت مستقیم متانول
کلمات کلیدی
سلول سوخت مستقیم متانول، رسانه پخش، متانول متقاطع، سوخت متانول بالا،
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
چکیده انگلیسی
Reducing methanol crossover from the anode to cathode in direct methanol fuel cells (DMFCs) is critical for attaining high cell performance and fuel utilization, particularly when highly concentrated methanol fuel is fed into DMFCs. In this study, we present a novel design of anode diffusion media (DM) wherein spatial variation of hydrophobicity along the through-plane direction is realized by special polytetrafluoroethylene (PTFE) coating procedure. According to the capillary transport theory for porous media, the anode DM design can significantly affect both methanol and water transport processes in DMFCs. To examine its influence, three different membrane-electrode assemblies are fabricated and tested for various methanol feed concentrations. Polarization curves show that cell performance at high methanol feed concentration conditions is greatly improved with the anode DM design with increasing hydrophobicity toward the anode catalyst layer. In addition, we investigate the influence of the wettability of the anode microporous layer (MPL) on cell performance and show that for DMFC operation at high methanol feed concentration, the hydrophilic anode MPL fabricated with an ionomer binder is more beneficial than conventional hydrophobic MPLs fabricated with PTFE. This paper highlights that controlling wetting characteristics of the anode DM and MPL is of paramount importance for mitigating methanol crossover in DMFCs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 39, Issue 3, 16 January 2014, Pages 1564-1570
نویسندگان
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