Improvement of material and performance analysis for gas diffusion layer in PEMFCs

• Main Authors: Kuei-Lin He, 何奎霖
• Other Authors: 宋家驥
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/06840413109327914736

碩士 === 國立臺灣大學 === 工程科學及海洋工程學研究所 === 101 === The PEMFC is one of the most important alternative energy sources. It decomposes hydrogen into hydrogen ions and electrons, while the hydrogen ions and oxygen combine to form water. This study replaces the general use of carbon black with carbon nanotube as the microporous layer of GDL. The study includes the analysis of the material for the microporous layer, the coating of the catalyst layer, the coating of the gas diffusion layer, the cell output performance test and accelerated test. In this study, first we combine the homemade Catalyst Coated Membrane(CCM) with a commercially available gas diffusion layer Gas Diffusion Layer (GDL) to compose a PEM fuel cell and test. After we prove it is worked for our process and performance, then we test our homemade GDL with carbon black and GDL with carbon nanotube, the most two important parameters are the weight percent of PTFE and the sintering time. If the PTFE content is too low, it will lead to insufficient hydrophobic microporous layer and easy to fall off; If the PTFE content is too high, it will lead to decreased conductivity, affect electronic transmission, and the sintering time is also an important factor in the decision of hydrophobicity. We analyze the PEMFCs with different materials, content of PTFE, sintering time, finally, we successfully make a PEMFC with performance close to the commercial one, and also find that it is more durable for the PEMFC with carbon nanotube as Micro Porous Layer (MPL) than the PEMFC with carbon black as MPL.