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Characterizing and Exploiting the Remarkable Surface Redox Chemistry of Ceria and Its Derivatives

表征和开发二氧化铈及其衍生物卓越的表面氧化还原化学

基本信息

批准号：
2130831
负责人：
Sossina Haile
金额：
$ 55.66万
依托单位：
Northwestern University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2021
资助国家：
美国
起止时间：
2021-09-01 至 2025-08-31
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2130831&HistoricalAwards=false
关键词：
Characterizing Exploiting Remarkable Surface Redox

项目摘要

NON-TECHNICAL DESCRIPTION: The goal of this research to advance the fundamental understanding of the behavior of the surfaces of ceria (CeO2), a technologically relevant material for a wide range of industrial processes and devices. These applications include solid oxide fuel cells, electrolyzers for water splitting, solar-driven thermochemical fuel production, chemical looping combustion, automotive 3-way catalysts, photodegradation of organic pollutants, and supercapacitors. The approach underway in this project combines preparation of materials with well-defined surface termination with advanced characterization tools. The insights gained enable deliberate engineering of structures and selection of appropriate chemistries to achieve exceptional performance. Students at multiple levels are incorporated into the research and training goals of this effort via internships for high school and undergraduate students, as well as doctoral research opportunities for graduate students.TECHNICAL DETAILS: This research aims to dramatically advance the understanding of the surface properties of ceria and its solid solutions. The PI proposes to acquire fundamental knowledge about the redox chemistry of both internal and exposed ceria surfaces using well-defined structures that support exquisite studies by sophisticated characterization techniques. Efforts include A.C. impedance spectroscopy of thin-film materials to determine surface activity as a function of termination, cation chemistry, and strain; angle-resolved X-ray adsorption spectroscopy studies of such films to determine both Ce oxidation state and local chemical environment about cation species; impedance studies of individually defined grain boundaries prepared by fusing film-on-substrate structures; and creation and manipulation of vertically aligned nanostructures, with potential memristive properties, via substrate modification. The research leverages the extensive growth and characterization tools available on campus. Students are engaged at multiple levels. Graduate students participate in all aspects of this research and develop mentorship skills by advising undergraduate students in summer research and senior thesis research. Furthermore, high school students participate in laboratory activities through the Northwestern Academy, a collaboration between Northwestern University and Evanston Township High.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.

非技术描述：本研究的目标是促进对铈（CeO2）表面行为的基本理解，这是一种广泛的工业过程和设备的技术相关材料。这些应用包括固体氧化物燃料电池、用于水分解的电解槽、太阳能驱动的热化学燃料生产、化学循环燃烧、汽车三向催化剂、有机污染物的光降解和超级电容器。该项目中正在进行的方法结合了具有明确表面终止的材料制备和先进的表征工具。所获得的见解使结构的刻意工程和选择适当的化学物质，以实现卓越的性能。通过为高中生和本科生提供实习机会，以及为研究生提供博士研究机会，将不同层次的学生纳入这项工作的研究和培训目标。技术细节：本研究旨在极大地促进对二氧化铈及其固溶体表面特性的理解。PI建议使用定义明确的结构来获取有关内部和暴露的二氧化铈表面氧化还原化学的基本知识，这些结构支持通过复杂的表征技术进行精细的研究。努力包括薄膜材料的交流阻抗谱，以确定表面活性作为终止，阳离子化学和应变的函数；角分辨x射线吸附光谱研究，以确定Ce氧化态和阳离子种类的局部化学环境；薄膜-衬底结构熔合制备的单独定义晶界的阻抗研究以及通过衬底修饰创造和操纵具有潜在忆阻特性的垂直排列纳米结构。该研究利用了校园内广泛的生长和表征工具。学生在多个层面上参与。研究生参与这项研究的各个方面，并通过在夏季研究和高级论文研究中为本科生提供建议来培养指导技能。此外，高中学生通过西北大学和埃文斯顿乡镇高中合作的西北学院参加实验室活动。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。