CAREER: Electrochemical Ceramics - Understanding the Gap between Localized and Collective Viewpoints of Electronic Structure

职业：电化学陶瓷 - 了解电子结构的局部观点和集体观点之间的差距

• 批准号: 0094253
• 负责人: Stuart Adler
• 金额: $ 31.24万
• 依托单位: Case Western Reserve University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-01 至 2002-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0094253&HistoricalAwards=false
• 关键词: CAREER; Electrochemical; Ceramics; Understanding; Gap

Electrochemical ceramics encompass a variety of present and emerging technologies, including gas sensors, fuel cells, gas-separation membranes, and membrane reactors. Of critical importance to modeling the properties of electrochemical ceramics, and developing new materials with improved performance, is a strong understanding of electronic structure. Since most electrochemical ceramics possess complex intermediate-length scale order, their properties often defy explanation when viewed from traditional paradigms invoking localized or collective viewpoints of electronic structure. In order to gain a more complete understanding of electronic structure in electrochemical ceramics, we propose to measure the populations of localized and delocalized electrons in transition metal perovskites having general composition LaSrCoFe oxides (LSCF) using a novel high-sensitivity Faraday balance. These measurements will be used to interpret parallel studies of electrochemical properties, including electron transport, ionic defect structure, chemical expansion and stress, and catalytic activity. In addition, the PI is currently developing a new program of undergraduate laboratory experiments that integrate research and teaching. This program provides undergraduates with formal opportunities to contribute to Ph.D.-level research in modern growth areas of chemical engineering, producing real data that will be published (not just put into a lab report). In this way research and undergraduate education are on the same track, with a complementary agenda. The proposed project will contribute one experiment to this educational program, which is linked (and feeds directly into) our research program in electrochemical ceramics. Students will screen new materials for electronic structure using high-temperature magnetic susceptibility measurements and Taguchi analysis methods.%%%This project will contribute broadly to our understanding of electronic structure in complex materials. The results are of general interest to all branches of materials science, including solid-state electrochemistry, electronic materials, ceramics, as well as inorganic chemistry and physics. This project will also provide specific information about electronic structure in one class of materials, of immediate value to workers developing reaction/separation membranes and solid-oxide fuel cells. The principal investigator has 8 years academic and 4 years industrial experience in this field, bringing a strong mix of fundamental and practical perspectives. This work is highly original, and contributes several novel advances to proven experimental techniques. The experimental plan is well organized, and the proposing institution has a world-class infrastructure for work in this cross-disciplinary field. In addition, the career development plan of the PI will help establish a strong fundamental research and educational program in a new, exciting, area of technology. This program will not only educate individual scientists in its field, but will also tightly integrate research and teaching in a way that benefits both, and opens new opportunities for undergraduates (many of whom, at CWRU, are women and minorities) to participate in cutting-edge research on a broad scale. This approach provides a new template for teaching that other higher-educational institutions may benefit from. Knowledge gained from both research and educational development will be disseminated broadly through the literature, and directly through strong ties of the PI to industry and the American Society of Engineering Education.

电化学陶瓷涵盖各种现有和新兴技术，包括气体传感器、燃料电池、气体分离膜和膜反应器。 对于电化学陶瓷的特性建模以及开发性能改进的新材料至关重要的是对电子结构的深刻理解。由于大多数电化学陶瓷具有复杂的中长尺度有序性，因此从电子结构的局部或集体观点的传统范式来看，它们的特性常常无法解释。 为了更全面地了解电化学陶瓷中的电子结构，我们建议使用新型高灵敏度法拉第天平测量具有一般成分 LaSrCoFe 氧化物 (LSCF) 的过渡金属钙钛矿中的局域和离域电子的数量。这些测量结果将用于解释电化学特性的并行研究，包括电子传输、离子缺陷结构、化学膨胀和应力以及催化活性。此外，PI目前正在开发一个集研究和教学于一体的本科生实验室实验新项目。该项目为本科生提供了为化学工程现代增长领域的博士级研究做出贡献的正式机会，产生将要发表的真实数据（而不仅仅是放入实验室报告中）。 这样，研究和本科教育就处于同一条轨道上，并且议程互补。拟议的项目将为该教育计划贡献一项实验，该实验与我们的电化学陶瓷研究计划相关（并直接纳入）。学生将使用高温磁化率测量和田口分析方法筛选电子结构新材料。%%%该项目将为我们对复杂材料中电子结构的理解做出广泛贡献。研究结果引起了材料科学所有分支的普遍兴趣，包括固态电化学、电子材料、陶瓷以及无机化学和物理学。 该项目还将提供有关一类材料中电子结构的具体信息，对开发反应/分离膜和固体氧化物燃料电池的工作人员具有直接价值。 首席研究员在该领域拥有 8 年学术经验和 4 年工业经验，带来了基础和实践观点的完美结合。 这项工作具有高度原创性，并为经过验证的实验技术做出了多项新颖的进展。 实验计划组织良好，提议机构在这一跨学科领域拥有世界一流的基础设施。 此外，PI 的职业发展计划将有助于在令人兴奋的新技术领域建立强大的基础研究和教育计划。该项目不仅将教育该领域的科学家个人，还将以一种对双方都有利的方式将研究和教学紧密结合起来，并为本科生（CWRU 的许多人是女性和少数族裔）参与切割创造新的机会。 - 广泛的边缘研究。这种方法提供了一个新的教学模板，其他高等教育机构可能会从中受益。从研究和教育发展中获得的知识将通过文献广泛传播，并直接通过 PI 与工业界和美国工程教育协会的紧密联系进行传播。