Metal-Metal and Metal-Molecule Interactions on Nanoisland Covered Single Crystal Electrodes

该项目由分析和表面化学计划资助，研究用于燃料电池中甲醇和甲酸电氧化的二元和三元过渡金属催化剂的结构和反应活性之间的相关性。这项工作主要是在伊利诺伊大学Andrzej Wieckowski的实验室进行的，研究了自发沉积在铂和金衬底上的Os或Ru纳米岛。用扫描隧道显微镜和电化学方法对这些结构进行了分析，并用XPS对结构进行了表征。北得克萨斯大学的合作者Paul Bagus进行的计算被用来帮助解释用于探测这些系统的详细的核心能级光谱。与C.Woell在波鸿的合作为这些纳米结构材料提供了基于同步加速器的高分辨率XPS研究。从这些研究中获得的信息可能适用于改进的燃料电池催化剂的设计。伊利诺伊州的Wieckowski和北得克萨斯大学的Bagus通过实验和计算相结合的研究，正在研究一系列纳米岛过渡金属催化剂系统的结构和反应活性之间的相关性。这些催化剂由沉积在铂或金衬底上的Os或Ru组成，在甲醇燃料电池中显示出作为有效的电氧化催化剂的前景。从这些基础研究中获得的信息可能有助于改进燃料电池系统的设计。

This project, funded by the Analytical and Surface Chemistry Program, addresses the correlation between the structure and reactivity of binary and ternary transition metal catalysts used for electrooxidation of methanol and formic acid in fuel cell contexts. The work, carried out primarily in the laboratories of Andrzej Wieckowski at the University of Illinois, examines spontaneously deposited nanoislands of Os or Ru deposited on Pt and Au substrates. STM and electrochemical methods are used to examine these structures, as well as emersed electrode XPS examination of the structures. Calculations carried out by co-P.I. Paul Bagus at the University of North Texas are used to help interpret the detailed core level spectroscopy used to probe these systems. Collaboration with C. Woell in Bochum provides high resolution synchrotron based XPS studies of these nano-structured materials. Information obtained from these studies may find applicability in the design of improved fuel cell catalysts.Using a combination of experimental and calculational studies, Wieckowski at Illinois, and Bagus at the University of North Texas, are examining the correlation between structure and reactivity of a series of nanoisland transition metal catalyst systems. These catalysts, consisting of Os or Ru deposited on Pt or Au substrates, show promise as effective electrooxidation catalysts in methanol fuel cell applications. Information obtained from these fundamental studies may aid in the design of improved fuel cell systems.