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Quantifying Surface Chemical Intermediates and Interfacial Redox Processes via Combined Raman Spectroscopy and Scanning Electrochemical Microscopy

通过拉曼光谱和扫描电化学显微镜相结合量化表面化学中间体和界面氧化还原过程

基本信息

批准号：
2004054
负责人：
Joaquin Rodriguez Lopez
金额：
$ 38.12万
依托单位：
University of Illinois at Urbana-Champaign
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-08-01 至 2024-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2004054&HistoricalAwards=false
关键词：
Quantifying Surface Chemical Intermediates Interfacial

项目摘要

Chemical reactions at electrode surfaces are essential for a large number of applications, which range from powering fuel cells to cleaning water. In addition, understanding the intimate details of those reactions is crucial to bolster renewable energy technologies. Unfortunately, all these important reactions at electrodes also display a broad range of complicated chemical reaction pathways that happen at a very small region close to the surface of the electrodes. This makes it very difficult to observe and understand how these reactions happen at the atomic level, which is key to improving them. Professor Rodriguez-Lopez addresses this pressing challenge by introducing a measurement technique where laser light, in combination with very small probes in a particular arrangement, are used to identify the chemicals formed at the surface of electrodes, while also identifying the reactions in which they participate. By carefully choosing some key electrode materials, Rodriguez-Lopez improves the ability to measure very small amounts of chemicals that speed up the product formation. The methods help understand how a promising catalyst for a fuel cell can lose activity, and how oxygen atoms at metals participate in key processes for energy technologies. The research plan benefits society by including hands-on activities for Hispanic children in the community. Advances electrochemical science is also taught to a diverse group of students to ensure a workforce with training at the forefront of science. With this award, the Division of Chemistry is funding Dr. Joaquin Rodriguez-Lopez at the University of Illinois to study development of a hybrid microscopy system for examination of chemical reactions at electrode surfaces. Exploring the mechanisms of interfacial electrocatalytic processes is challenging, however knowledge about reactive intermediate identity, surface coverage, and reactivity, is critical in understanding in situ approaches. Dr. Rodriguez-Lopez investigates a simultaneous, spatiotemporally matched approach for the in situ quantification of reactive intermediates at electrochemical interfaces through integration of scanning electrochemical microscopy with Raman spectroscopy. The research may improve the spatial resolution of the technique by using micro and nanoelectrodes of different sizes. Rodriguez-Lopez aims to help solve long-standing challenges in electrocatalysis by correlating electrode reactivity to surface properties of materials in fuel cells, electrolyzers, and batteries, as well as in systems for water remediation, electrosynthesis, and corrosion prevention. The project integrates educational and outreach plans that engage students of Hispanic origin in scientific activities, as well as the organization of an electrochemical bootcamp that helps ensure the presence of a diverse workforce at the forefront of electrochemical and measurement science.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

电极表面的化学反应对于许多应用至关重要，从为燃料电池供电到清洁水。此外，了解这些反应的详细细节对于支持可再生能源技术至关重要。不幸的是，电极上的所有这些重要反应也显示出广泛的复杂化学反应路径，这些路径发生在靠近电极表面的非常小的区域。这使得在原子水平上观察和理解这些反应如何发生变得非常困难，而这是改进它们的关键。罗德里格斯-洛佩兹教授通过引入一种测量技术来解决这一紧迫的挑战，在该技术中，激光与特定排列的非常小的探针相结合，用于识别电极表面形成的化学物质，同时还识别它们参与的反应。通过仔细选择一些关键电极材料，Rodriguez-Lopez 提高了测量极少量化学品的能力，从而加速了产物的形成。这些方法有助于了解一种有前途的燃料电池催化剂如何失去活性，以及金属中的氧原子如何参与能源技术的关键过程。该研究计划通过为社区中的西班牙裔儿童开展实践活动来造福社会。还向不同的学生群体教授先进的电化学科学，以确保劳动力接受科学前沿的培训。凭借该奖项，化学系正在资助伊利诺伊大学的 Joaquin Rodriguez-Lopez 博士研究开发用于检查电极表面化学反应的混合显微镜系统。探索界面电催化过程的机制具有挑战性，但是有关反应中间体特性、表面覆盖度和反应性的知识对于理解原位方法至关重要。 Rodriguez-Lopez 博士研究了一种同步、时空匹配的方法，通过扫描电化学显微镜与拉曼光谱的集成，对电化学界面上的反应中间体进行原位定量。该研究可以通过使用不同尺寸的微米和纳米电极来提高该技术的空间分辨率。 Rodriguez-Lopez 旨在通过将电极反应性与燃料电池、电解槽和电池以及水修复、电合成和防腐系统中材料的表面特性相关联，帮助解决电催化领域长期存在的挑战。该项目整合了教育和推广计划，吸引西班牙裔学生参与科学活动，并组织电化学训练营，帮助确保电化学和测量科学前沿的多元化劳动力。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。