Studies on Understanding and Reducing Fuel Permeation through Polyelectrolyte Membranes for Fuel Cells

通过燃料电池聚电解质膜了解和减少燃料渗透的研究

• 批准号: 16560659
• 负责人: TANAKA Kazuhiro
• 金额: $ 2.37万
• 依托单位: Yamaguchi University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16560659/
• 关键词: Fuel Cell; Sulfonated polyimides; Polyelectrolyte; Proton transport; Gas permeation; Crossover; DMFC; 高分子電解質; 水素ガス; スルホン化ポリイミド

Two types of sulfonated copolyimides (co-SPIs) were prepared from 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTDA), two types of sulfonated diamines, namely, 4,4'-bis(4-sulfophenoxy)biphenyl-3,3'-disulfonic acid (BAPBDS) and bis(3-sulfopropoxy)benzidines (BSPBs), and common nonsulfonated diamines via statistical polycondensation reaction. The BSPB-based co-SPI membranes had a clear microphase-separated structure composed of hydrophilic and hydrophobic domains but the connection of hydrophilic domains was rather poor. On the other hand, the BAPBDS-based co-SPI membranes did not show such a clear micro-phase separation. The co-SPI membranes showed high proton conductivities of 0.10-0.16 S/cm in water at 323 K, which was comparable to that of Nafion 112 (0.13 S/cm). The methanol permeabilities of the co-SPI membranes hardly depended on feed composition. They were more than two times smaller than those of Nafion 112. As a result, the co-SPI membranes showed more than two times larger … More ratios of proton conductivity over methanol permeability than Nafion, suggesting high potential for direct methanol fuel cell application.The water and methanol crossover through membrane under the fuel cell operation conditions is not controlled by electro-osmosis due to proton transport but by diffusion due to activity difference. This is quite different from the case of perfluorosulfonated membranes such as Nafion and results in the advantageous effects on fuel cell performance. SPI membranes displayed higher performances in DMFC systems with higher methanol concentration (20-50 wt %), which is superior to Nafion and have high potential for DMFC applications at mediate temperatures (310-350 K).Gas permeability for sulfonated homopolyimides were measured and compared to those of the non-sulfonated homopolyimide having the same polymer backbone. With increasing relative humidity from 0% RH to 90% RH, the gas permeability for NTDA-BAPHFDS(H) polyimide increased by more than one order of magnitude. On the other hand, the gas permeability for the non-sulfonated polyimide slightly decreased with increasing humidity. Less

从1,4,5,8-萘苯甲酸苯乙烯二氢化苯二酚（NTDA）制备了两种类型的磺酸聚糖酰亚胺（CO-SPI），两种类型的硫磺二氧化硫二含硫二硫代硫酸二硫酸含硫代二硫酸含硫二酰亚胺，即4,4'-二二硫代（4,4'-bis）双（3-硫丙丙啶）苯甲酸盐（BSPB）和常见的非磺扬二硫二氧化二敏反应。基于BSPB的CO-SPI膜具有由亲水和疏水结构域组成的明显的显微镜分离结构，但是亲水性结构域的连接较差。另一方面，基于BAPBD的CO-SPI膜没有显示出如此明显的微相分离。 CO-SPI膜在323 K的水中显示高质子电导率为0.10-0.16 s/cm，与Nafion 112（0.13 S/cm）相当。 Co-SPI膜的甲醇渗透率几乎不取决于饲料组成。它们的比Nafion 112小的两倍以上。结果，Co-SPI膜显示出大的两倍以上……质子电导率比Nafion的比率高，这表明直接甲醇燃料电池施用的可能性很高。在燃料电池操作条件下，通过膜的水和甲醇交叉不受质子转运引起的电渗透的控制，而是由于活性差异而导致的差异。这与诸如Nafion之类的全氟磺化膜的情况大不相同，并对燃料电池性能产生有利影响。 SPI膜在甲醇浓度较高（20-50 wt％）的DMFC系统中表现出较高的性能，该系统比Nafion优于Nafion，并且在介导的温度（310-350 K）的DMFC应用中具有很高的潜力。与非二酰基相比，与硫磺二酰亚胺相比，硫二酰亚胺的硫二酰亚胺具有相同的硫二酰亚胺的持续性。随着从0％RH到90％RH的相对湿度的增加，NTDA-BAPHFDS（H）聚酰亚胺的气体渗透性增加了多个数量级。另一方面，非硫代聚酰亚胺的气体渗透性随着湿度的增加而略有降低。较少的

项目成果

Gas permeation and separation properties of sulfonated polyimide membranes

• DOI: 10.1016/j.polymer.2006.04.001
• 发表时间: 2006-05
• 期刊: Polymer
• 影响因子: 4.6
• 作者: Kazuhiro Tanaka;M. Islam;Masayoshi Kido;H. Kita;K. Okamoto