On-line System Designing for Multi Function DMFCs

优先领域的研究项目D进行了几项与直接型燃料电池系统开发有关的研究。该小组还开发了各种测量系统和特殊分析方法，以支持其他研究项目，即与膜材料开发有关的研究项目A，与催化剂和电极材料研究有关的研究项目B，与膜和电极组件(MEA)优化研究有关的研究项目C。项目D中的系统开发研究包括3项任务，即(1)开发乙醇燃料电池系统作为有毒DMFC燃料系统的替代品，(2)使用碱性聚合物膜材料开发PEFC，(1)研究了直接乙醇燃料电池，考察了中间产物乙醛在阳极反应中的行为。在此…中获得的知识更多的分析有助于实现直接乙醇燃料电池(DEFC)。(2)碱性燃料电池具有阴极过电位低的优点，为无贵金属催化剂提供了条件。我们研制了一种碱性膜燃料电池。对电池进行了甲醇、乙醇和异丙醇燃料的测试。电池的性能取决于燃料的pH值。改善碳颗粒的分散特性是碱性膜燃料电池的研究课题。(3)设计并制备了基于MEMS技术的新型微型直接甲醇燃料电池。采用选择性等离子体刻蚀的方法制作了电池中的气体通道。该技术减少了直接甲醇燃料电池的组件数量，降低了组装成本，减小了体积。利用本课题组研制的聚焦离子束系统对膜电极横截面进行的透射电子显微镜和扫描电子显微镜观察方法，澄清了膜电极与电解质膜的界面结构，有效地支持了整个优先领域的研究项目。较少

The Research Project D in the Priority Area conducted several studies related to the system development of direct type fuel cells. This group also developed various measurement systems and special analytical methods, to support the other Research Projects, i.e., Research Project A relating to the development of membrane materials, Research Project B relating to the studies of catalyst and electrode materials, and Research Project C relating to the study on the optimization of membrane and electrode assembly (MEA).The system development studies in the Project D include 3 tasks, i.e., (1) development of an ethanol fuel cell system as an alternative to the toxic DMFC fuel system, (2) development of PEFCs using alkaline polymer membrane materials, and (3) miniaturization of DMFCs using micro fabrication method.(1) A direct ethanol fuel cell is studied and the behavior of the acetaldehyde which is an intermediate product in the anode reaction was investigated. The knowledge obtained in this … More analysis contributes to the realization of direct ethanol fuel cells (DEFCs).(2) Alkaline fuel cells have the advantages that they lower the cathode overpotential, and they provide conditions suitable for catalysts without precious metals. We developed a fuel cell with alkaline membrane. The cell was tested for methanol, ethanol, 2-propanol fuels. The performance of the cell depended on the pH of the fuels. The improvement of the dispersion characteristic of carbon particles was the issue of the alkaline membrane fuel cells.(3) Novel micro DMFCs based on MEMS technology were designed and fabricated. The selective plasma etching method was employed to fabricate the gas channels in the cell. This technology reduces the number of the components in a DMFC and reduces the assembly cost as well as reduces their sizes.The TEM and SEM observation method for the cross section of MEA using a focused ion beam system, which was developed in this group, clarified the structure of the interface between the electrode and electrolyte membrane in the MEAs, and effectively supported the whole research project in the Priority Area. Less