Experimental Studies of Dry Layer Preparation in Suction Method of PEMFC Membrane Electrode Assemblies
Date Issued
2004
Date
2004
Author(s)
Cheng, Shih-Tse
DOI
zh-TW
Abstract
As production cost will be one of the main challenges for commercialization of fuel cells, a new approach to MEA production for PEMFC has been considered. Electrodes are produced by a new dry layer preparation method in a suction procedure and co-operated with a particle diffusion design.
All structures in MEA of this process were prepared without any organic solvent; therefore the time of preparation procedures can be drastically reduced. MEA’s sandwiched structures were constituted by many materials- diffusion substrate, carbon powder, PTFE, catalyst, ion conductor, Nafion membrane. A slight difference in the quantity and character of each material will cause a apparent influence on the performance of MEAs.
In gas diffusion backing layer the content of PTFE is about 40wt% and with high surface-area Ketjen Black EC600 at an optimized thickness, show better performance compared with Acetylene black and Ketjen Black EC300 carbon in backing layer. In catalyst layer preparation the suction pressure and the flow rate of nitrogen affects directly in the performance of MEA. When the pressure at 12 cm water height and the nitrogen flow rate at 4L/min show an obvious higher power density 0.21 W/cm2. The Pt loading is controlled between 0.4~0.5mg/cm2.
This new dry layer preparation method with suction and powder diffusion procedure offers a simple, rapid and reliable method for MEA’s production. A faster and a low cost objective can be achieved.
Subjects
性能量測
電極
薄膜電極組
MEA
performance
electrode
Type
thesis
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