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.

电化学陶瓷包括各种当前和新兴技术，包括气体传感器，燃料电池，气体分离膜和膜反应器。 对电化学陶瓷的特性以及开发具有改善性能的新材料的重要性至关重要，这是对电子结构的深刻理解。由于大多数电化学陶瓷都具有复杂的中间长度级顺序，因此从传统的范式中观察到电子结构的局部或集体观点时，它们的性质通常会违背解释。 为了更完整地了解电化学陶瓷中的电子结构，我们建议使用新型的高敏感性法拉第平衡来测量具有一般组成拉斯克罗氧化物（LSCF）的过渡金属钙钛矿中局部和离域电子的种群。这些测量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，化学膨胀和应激以及催化活性。此外，PI目前正在开发一项新的本科实验室实验计划，以整合研究和教学。该计划为大学生提供了正式的机会，可以为化学工程现代增长领域的博士学位研究做出贡献，从而产生将发布的真实数据（不仅仅是实验室报告）。 这样一来，研究和本科教育就在同一条轨道上，并具有互补的议程。拟议的项目将为该教育计划做出一个实验，该计划与我们在电化学陶瓷方面的研究计划联系起来。学生将使用高温磁化敏感性测量和Taguchi分析方法筛选电子结构的新材料。%% %%此项目将在复杂材料中对我们对电子结构的理解广泛贡献。结果对所有材料科学分支的普遍感兴趣，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特定信息，这是对开发反应/分离膜和固体氧化燃料电池的工人的直接价值。 首席研究人员在该领域拥有8年的学术和4年的工业经验，带来了基本和实用的观点。 这项工作是高度原始的，并为经过验证的实验技术做出了一些新的进步。 实验计划组织得很​​好，提议机构在这个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新的，令人兴奋的技术领域建立强大的基础研究和教育计划。该计划不仅将教育其领域的个人科学家，而且还将以受益的方式紧密整合研究和教学，并为本科生打开新的机会（其中许多在CWRU，是妇女和少数群体）参加切割 - 大规模的边缘研究。这种方法为教学提供了一个新的模板，以使其他高等教育机构受益。从研究和教育发展中获得的知识将通过文献广泛传播，直接通过PI与工业和美国工程教育学会的紧密联系。