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Study of alcohol electrooxidation mechanism at nano-particle electrocatalyst by using integrated powder microelectrodes

利用集成粉末微电极研究纳米颗粒电催化剂醇的电氧化机理

基本信息

批准号：
16350098
负责人：
UMEDA Minoru
金额：
$ 9.98万
依托单位：
Nagaoka University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

Thus far, electrocatalyst investigations have consisted of two categories ; one is Pt-plate electrode-based fundamental study and the other is Pt-loading carbon-based single-cell characteristic study. The present report is planned to study alcohol electrooxidation mechanism directly at powder electrocatalysts for use in direct alcohol fuel cells (DAFCs) by employing a powder microelectrode without any influence of binder polymer. We have focused our attention on an electrocatalyst of Pt-loading carbon (Pt/C) and filled it to the microcavity of the powder microelectrode to measure the alcohol oxidation activity easily and precisely. Investigated topics are summarized as follows. Powder microelectrode filled with Pt/C or Pt-Ru/C is utilized to measure I-V curves of C_1-C_4 alcohol oxidation under elevated temperature and pressurized conditions. In addition, a dual microelectrode of powder microelectrode combined with microdisk electrode was fabricated, in which the latter collector electrode successfully detected the reaction product of alcohol oxidation at the former generator electrode. Moreover, reaction products/intermediates produced at the membrane-electrode assembly was investigated in order to clarify the reaction pathways, by developing analyzing equipment. Furthermore, electrochemical solid-state half cell was fabricated to investigate the difference of alcohol oxidation reactions between aqueous system and proton-exchange-membrane-based solid system. In conclusion, by designing new electrode system to evaluate the functional materials used in the DMFCs, electrochemical studies for the powder electrocatalysts and the electrocatalyst-based cell systems have been greatly improved.

迄今为止，电催化剂的研究主要包括两大类：一类是基于铂板电极的基础研究，另一类是基于铂负载碳的单电池特性研究。本报告计划研究直接醇燃料电池（DAFC）中使用的粉末电催化剂上的醇的电氧化机理，采用粉末微电极，没有任何影响的粘合剂聚合物。本文研究了一种载铂碳（Pt/C）电催化剂，并将其填充到粉末微电极的微腔中，以方便、准确地测定乙醇的氧化活性。调查的主题总结如下。采用Pt/C或Pt-Ru/C粉末微电极，在高温加压条件下测定了C_1-C_4醇氧化的I-V曲线。此外，还制备了粉末微电极与微盘电极相结合的双微电极，后者的集电极成功地检测了前者发生电极上的醇氧化反应产物。此外，通过开发分析设备，研究了在膜电极组件处产生的反应产物/中间体，以澄清反应途径。此外，制备了电化学固态半电池，研究了醇在水溶液体系和质子交换膜固体体系中氧化反应的差异。总之，通过设计新的电极系统来评估DMFC中使用的功能材料，粉末电催化剂和基于电催化剂的电池系统的电化学研究得到了很大的改善。