Applications of Alkynyl-linked Transition Metal Compounds on Chemically Modified Electrodes

炔基过渡金属化合物在化学修饰电极上的应用

• 批准号: 1565541
• 负责人: William Geiger
• 金额: $ 48万
• 依托单位: University of Vermont & State Agricultural College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-08-01 至 2021-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1565541&HistoricalAwards=false
• 关键词: Applications; Alkynyl; linked; Transition; Metal

In this project funded by the Chemical Structure, Dynamics and Mechanisms B Program in the Division of Chemistry, Professor William E. Geiger of the University of Vermont is studying electrochemistry in addressing chemical, biochemical, and environmental problems. The most common type of electrochemical cell is one in which two metal electrodes communicate through an electrolyte solution, with chemical reactions taking place at each electrode. Traditionally, the electrodes have been composed of expensive and rare metals such as platinum and gold. In the interest of both cost and sustainability, these traditional metals need to be replaced by cheaper and more common, preferably carbon-based, materials. However, carbon surfaces themselves lack the chemical structure needed to carry out many important reactions, such as those required in efficient fuel cells. The project is designed to molecularly alter the surface structure of carbon, thereby increasing the efficiency of these reactions. These studies provide training in electrochemistry and transition-metal chemistry for undergraduate and graduate students, in addition to high school students. The students are also experiencing other research groups through a number of collaborating arrangements. Professor Geiger is developing a new chemical electrode modification method based on electrochemical oxidation of either an ethynyl-containing molecule or a metal-activated ethynyl molecule. An ethynyl group provides a nearly ideal linkage between a molecular substrate and a carbon surface owing to its ability to offer facile electronic communication between those moieties, its very strong bonding to the surface, and its structural integrity. Both organometallic molecules and porphyrin complexes containing transition metals are being attached to the electrode surfaces. Routes to electrode modification by porphyrins containing a number of different transition metals are being be explored, and one or more electrocatalytic reactions, such as the oxygen reduction reaction, are being probed. Electrodes also are being modified with ethynyl-linked metal photosensitizers and ethynyl-linked multi-electron transfer agents, with the goal of providing new electrode surfaces for efficient biosensors and neural sensors. A new approach to analysis of chemically modified electrodes by magnetic circular dichroism is being studied.

在化学结构，动态和机制B计划资助的该项目中，佛蒙特大学的William E. Geiger教授正在研究解决化学，生化和环境问题方面的电化学。最常见的电化学细胞是一个通过电解质溶液进行两种金属电极通信的类型，每个电极在每个电极都进行化学反应。传统上，电极由昂贵且稀有的金属（例如铂金和黄金）组成。为了获得成本和可持续性，这些传统金属需要更便宜，更常见的材料，更常见的材料。但是，碳表面本身缺乏执行许多重要反应所需的化学结构，例如有效的燃料电池中所需的反应。该项目旨在分子改变碳的表面结构，从而提高这些反应的效率。这些研究除了高中生外，还为本科和研究生提供了电化学和过渡金属化学培训。学生还通过许多协作安排来体验其他研究小组。 Geiger教授正在开发一种新的化学电极修饰方法，该方法基于含有乙醇的分子或金属激活的乙醇分子的电化学氧化。 Ethynyl组由于能够在这些部分之间提供便捷的电子通信，与表面的非常牢固的键合及其结构完整性，提供了分子底物和碳表面之间几乎理想的联系。有机金属分子和含有过渡金属的卟啉络合物都附着在电极表面上。正在探索通过含有多种不同过渡金属的卟啉进行电极修饰的途径，并正在探测一种或多种电催化反应，例如氧还原反应。电极还通过乙醇连锁的金属光敏剂和乙基链接的多电子传递剂进行了修饰，目的是为有效的生物传感器和神经传感器提供新的电极表面。正在研究通过磁性圆形二色性分析化学修饰电极的新方法。