Study on fabrication and characteristics of Sulfonated poly(imide-siloxane) as Membrane Electrode Assembly for Polymer Electrolyte Membrane Fuel Cells

• Main Authors: Hui-Shan Cai, 蔡惠珊
• Other Authors: Yen-Zen Wang
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/38363141338855795532

碩士 === 國立雲林科技大學 === 化學工程與材料工程研究所 === 97 === In this study, The sulfonated poly (imide-siloxanes) (SPI-SXs) were synthesized using 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTDA), aminopropyl-terminated polydimethylsiloxane (PDMS), 2,2 -benzidinedisulfonic acid (BDSA) as the sulfonated diamine groups. The prepared membranes were characterized in terms of FT-IR, H1-NMR, water uptake, dimensional changes and proton conductivity. Proton conductivity of the SPI-SX membranes was compared with one of the Nafion® membranes with saturated humidity. The adhesion effect and porosity of catalyst electrodes in membrane-electrode assemblies (MEAs) using a Nafion® ionomer was investigated according to physical and electrochemical properties by varying the content of ionomer binder in the catalyst electrodes. The SPI-SX-based MEAs were compared with the Nafion®-based MEA using Nafion® 212 and 5 wt.% ionomer solution in terms of adhesion values, the scanning electron microscopic(SEM) images and I–V polarization curves. According to the results of SEM and I–V polarization curves, the electrodes using 0.3mg/cm2, 35% and 0.5mg/cm2, 35% loading of Nafion® ionomer for respectivetiveSPI-SX-based and Nafion 212 membranes, might have the similar electrode configuration in terms of porosity. Improvement on electrochemical properties (i.e.I–V polarization curves) was shown up to the Nafion® ionomer content more than of 35% in the catalyst layers for SPI-SX-base membrane. As a result, the performance of the new type polymer (i.e. SPI-SX in this study)-based MEA with the similar membrane conductivity, adhesion effect and porosity of the catalyst electrode in the Nafion® MEA was similar to that of the Nafion® MEA. It is believed that adhesion effect and porosity control suggested in this study can be one of main parameters to design MEA’s electrodes prepared by various polymers.