Electrochemical Processes Studied Ex-Situ with Ultrahigh Vacuum Surface Analysis

通过超高真空表面分析进行非原位电化学过程研究

• 批准号: 9103543
• 负责人: Eric Stuve
• 金额: $ 25.4万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-09-01 至 1995-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9103543&HistoricalAwards=false
• 关键词: Electrochemical; Processes; Studied; Ex; Situ

By combining ultrahigh vacuum (UHV) surface analysis with electrochemistry, ex situ studies offer a new, vastly detailed route for examining electrochemical phenomena. This approach is applied to the study of methanol and formic acid electrocatalysis on single crystal, metal electrodes. These reactions are important in fuel-cell applications, but the lack of mechanistic understanding, particularly of spontaneous poisoning, inhibits further development. This work applies concepts from gas-phase heterogeneous catalysis to build a paradigm for understanding electrocatalytic behavior. The mechanistic details of the reactions, individually and in the presence of modifiers, are studied with a combination of UHV and electrochemical cross-characterization experiments and post-electrochemical analyses in UHV. The growth modes and surface chemistry of metallic and nonmetallic modifiers are examined as well. The research directly address the important issues that stand in the way of development of direct methanol fuel cells. However, of perhaps equal importance to the advancement of this important (because of energy resource limitations and environmental considerations) technology is the development and refinement of the ex situ methodology for the study of electrochemical systems, which could have a major impact on industrial process work.

通过将超真空（UHV）表面分析与 电化学，非原位研究提供了一个新的，非常详细的 研究电化学现象的途径。 这种方法 应用于甲醇和甲酸的研究 电催化单晶，金属电极。 这些 反应在燃料电池应用中是重要的，但是 缺乏机械的理解，特别是自发的 中毒，抑制进一步发展。 这项工作适用于 从气相多相催化的概念，以建立一个 理解电催化行为的范例。 的 反应的机理细节，单独和在 存在的改性剂，研究了超高真空组合 和电化学交叉表征实验， 特高压下的后电化学分析。 增长模式和 金属和非金属改性剂表面化学是 也进行了检查。 这项研究直接解决了存在的重要问题 直接甲醇燃料电池的发展方向。 然而，也许同样重要的是， 这一点很重要（由于能源资源的限制， 环境考虑）技术是发展 和改进非原地方法， 电化学系统，这可能会产生重大影响 工业过程工作。