Structured Islands on Single Crystal Electrodes: Surface Dynamics and the Reactivity at the Edge of the Islands

该研究项目由分析和表面化学项目支持，继续研究燃料电池电极的表面电化学。Wieckowski教授和他在伊利诺伊大学的同事们正在研究由钌和锇共吸附物沉积形成的铂单晶电极上的岛的结构和反应性。三元岛结构也在调查之中。扫描探针显微镜结合电化学方法和超高真空样品的制备和表征，研究了甲醇在这些电极表面的电氧化。研究了岛边效应和硫共吸附对这一重要燃料电池反应动力学的影响。这些研究结果对燃料电池电催化剂和电极的设计具有重要意义。用于燃料电池应用的铂电极上的二元和三元金属岛的结构是本研究项目的主题，该研究项目得到了分析和表面化学计划的支持。伊利诺伊大学的Wieckowski教授和他的同事们正在使用扫描探针显微镜和电化学方法来检测这些模型电极表面的甲醇电氧化。这项研究的信息对改进燃料电池电极的设计是有用的。

This research project, supported by the Analytical and Surface Chemistry Program, continues studies of the surface electrochemistry of fuel cell electrodes. Professor Wieckowski and his coworkers at the University of Illinois are carrying out studies of the structure and reactivity of islands on platinum single crystal electrodes formed by the deposition of ruthenium and osmium co-adsorbates. Ternary island structures are under investigation as well. Scanning probe microscopy coupled with electrochemical methods and ultra-high vacuum sample preparation and characterization is used to investigate the electrooxidation of methanol on these electrode surfaces. Island edge effects, and the effect of sulfur coadsorption on the dynamics of this important fuel cell reaction is studied. The results of these studies are useful in the design of electrocatalysts and electrodes for fuel cell applications. The structure of binary and ternary metallic islands on platinum electrodes used in fuel cell applications is the subject of this research project supported in the Analytical and Surface Chemistry Program. Professor Wieckowski and coworkers at the University of Illinois are using scanning probe microscopy and electrochemical methods to examine methanol electrooxidation on these model electrode surfaces. Information from this research is useful in the design of improved fuel cell electrodes.