Video-STM studies of adsorbate dynamics at electrochemical interfaces

电化学界面吸附物动力学的视频 STM 研究

• 批准号: 111205716
• 负责人: Professor Dr. Olaf Magnussen
• 金额: --
• 依托单位: Department of Chemistry
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/111205716?language=en
• 关键词: Video; STM; studies; adsorbate; dynamics

In this project the dynamic behavior of individual adsorbates at electrochemical interfaces will be studied systematically by in situ high-speed scanning tunneling microscopy (Video-STM). These measurements will be performed as a function of potential and temperature for different anionic (S, I, CN) and cationic (Pb, Te, vacancies) adsorbates on Cu(100) and Ag(100) electrode surfaces. The atomic-scale adsorbate motion will be directly monitored by time-resolved STM. Based on an extensive statistical analysis of these data quantitative results on surface diffusion and adsorbate-adsorbate interactions will be obtained. In particular, the role of coadsorbed species (Cl, Br, sulfate) and potential on the adsorbate dynamics will be investigated, to (i) elucidate the origin of the pronounced potential dependence of the surface transport processes, found in our pioneering studies on Sad diffusion on Cu(100) in HCl solution, and to (ii) determine how coadsorbates, which are ubiquitously present in electrochemical environment, influence the diffusion barriers and interaction energies. This project will be complemented by a parallel application for a project, in which thermodynamic and kinetic electrochemical data on these adsorbate systems will be obtained in parallel. In total, these direct microscopic and complementary electrochemical studies should provide fundamental insights into the effect of the electrochemical environment on the diffusion and interaction of adsorbed species – a central elementary step in many electrode reactions.

在这个项目中，通过原位罐头隧道显微镜（Video-STM）进行了系统的界面，在电化学界面上进行了动态。 PB，TE，空位）和AG（100）电极表面，基于时间分辨的STM，原子尺度的吸附物将基于这些数据定量结果的统计分析。 CL，BR，硫酸盐）和吸附物动力学的潜力将进行研究，以（i）阐明表面传输过程的明显潜在依赖性的起源，这是我们关于SAD扩散（100）W Codesorbates的开创性研究，该研究的开创性研究，在电化学环境中存在普遍存在的，会影响该项目的扩散屏障和相互作用能量。 Providel对电化学环境关于吸附物种的扩散和相互作用的洞察力 - 许多电极现实中的中央基本步骤。