Constractional study of nano electrocatalysts for functionalization of three phase interface

在燃料电池电极中，平面电极和实际的粉末电催化剂之间存在巨大的差距。这是因为后一种结构由于其三维构造而复杂;纳米催化剂颗粒负载在纳米亚微米颗粒上。为了使含有粉末电催化剂的三相界面功能化，我们开发了通过独立地改变催化剂颗粒的尺寸和颗粒间距来构建催化剂颗粒。此外，使用所构建的电极的电极反应进行了研究。此外，进行了使用粉末催化剂的膜电极组件（MEA）和燃料电池的研究。例如，我们进行了以下实验：（1）模型电催化剂的掩模制作，（2）基于掩模制作技术的Pt降解的非原位SEM观察，（3）O_2还原过程中H_2O_2副产物的扫描电化学显微镜研究，（4）直接甲醇燃料电池电极调节的改进，（5）甲醇和氧气存在下的反应选择性研究。因此，主要进行了消除二维和三维电极之间的大间隙的研究。

A huge disparity exists between a planar electrode and a practical powder electrocatalyst for a utilization in fuel cell electrode. This is because that the latter structure is complicated owing to its three dimensional construction ; nano catalyst particles are loaded on electroconductive submicron particles. In order to functionalize the three phase interface containing the powder electrocatalyst, we developed to construct the catalyst particle by changing its size and interparticlar distance independently. In addition, electrode reactions using the constructed electrode were investigated. Moreover, investigations of membrane electrode assemblies(MEAs) and fuel cells using the powder catalysts were conducted. For instance, the following experiments were carried out :(1) mask fabrication of modeled electrocatalysts,(2) ex-situ SEM observation of Pt degradation based on the mask fabrication technique,(3) scanning electrochemical microscopy study of H_2O_2 byproduct generation during O_2 reduction,(4) an improvement of electrode conditioning at direct methanol fuel cell, and(5) reaction selective studies in the presence of methanol and oxygen. Consequently, an investigation to vanish the large gap between two and three dimensional electrodes was mostly progressed.