Collaborative Research: Elucidating the Roles of Electric Fields Within Mixed Ionic and Electronic Conducting Oxides Under Electrochemical Reducing Conditions

合作研究：阐明电化学还原条件下混合离子和电子导电氧化物中电场的作用

• 批准号: 2333166
• 负责人: Eranda Nikolla
• 金额: $ 34.65万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-07-01 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2333166&HistoricalAwards=false
• 关键词: Collaborative; Research; Elucidating; Roles; Electric

NON-TECHNICAL DESCRIPTION: High temperature electrochemical devices are critical elements needed for new high efficiency energy conversion systems. For example, a solid oxide electrolysis cell can provide hydrogen via steam electrolysis. Alternatively, as envisioned in this work, such a system can also provide syngas (carbon monoxide and hydrogen) from steam and carbon dioxide. Such complex systems operate with high efficiency and can use electricity obtained from intermittent power sources. However, their performance requires proper optimization to avoid degradation. Recent work has shown that mixed ionic-electronic conducting oxide-based cathodes exhibit promising activity and stability, which facilitates the use of pure carbon dioxide in the feed. However, a fundamental understanding of how these oxides work for processing of carbon dioxide is still limited. In this project, PIs Nikolla and McEwen integrate experiments and theory to determine how a mixed ionic-electronic conducting ceramic material interacts with carbon dioxide to facilitate its processing. Design criteria for identification of robust (active and stable) oxide cathodes in a solid oxide electrolysis cell environment are being developed. PIs Nikolla and McEwen are also actively engaged in outreach activities through training graduate and undergraduate students, who typically find employment in industry or academia. The research team also partners with industry by interacting with the Toyota Research Center. As such, this research exposes students to an industrial research environment and enables them to see the link between fundamental work in academia and application in industry.TECHNICAL DETAILS: Experimental and theoretical techniques are combined to develop a fundamental understanding of the electrochemical reduction of CO2 on mixed ionic-electronic conducting (MIEC) oxides. This fundamental understanding then enables design criteria for identification of robust (active and stable) oxides as solid oxide electrolysis cell (SOEC) cathodes to be defined. SOECs are high temperature, solid-state electrolyzers characterized by high efficiencies and unique scalability. In this project, the heterogeneities in an oxide layer, which alter the local electric field at its surface and correlate to the performance of a SOEC, are examined and the effect of the composition on the reducibility of MIEC oxides is elucidated. This knowledge is used to define the design criteria for robust MIEC-cathode SOECs. Activities that enhance the education of the next generation of students, including a summer research exchange program among the two groups for students, and partnerships with the Toyota Research Center that expose students to an industrial research environment and provide a link between the fundamental work in academia and application in industry, ensure the broad impacts of this project.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：高温电化学设备是新的高效能量转换系统所需的关键要素。例如，固体氧化电解细胞可以通过蒸汽电解提供氢。另外，正如这项工作中所设想的那样，这种系统还可以从蒸汽和二氧化碳提供合成剂（一氧化碳和氢）。这种复杂的系统以高效率运行，可以使用从间歇性电源中获得的电力。但是，它们的性能需要适当的优化以避免降解。最近的工作表明，基于氧化物的阴极的混合离子电子传导表现出有希望的活性和稳定性，这有助于在进料中使用纯二氧化碳。但是，对这些氧化物如何处理二氧化碳如何工作的基本了解仍然有限。在这个项目中，PIS Nikolla和McEwen整合了实验和理论，以确定混合离子电导传导陶瓷材料如何与二氧化碳相互作用以促进其加工。在固体氧化电解细胞环境中鉴定鲁棒（活跃和稳定的）氧化物阴极的设计标准正在开发。 PIS Nikolla和McEwen还通过培训毕业生和本科生积极从事外展活动，他们通常在工业或学术界找到工作。研究团队还通过与丰田研究中心互动，与行业合作。因此，这项研究使学生暴露于工业研究环境，并使他们能够看到学术界的基本工作与行业中的应用之间的联系。技术细节：实验和理论技术合并，以对对CO2电化学对CO2的电化学减少的基本了解进行结合。混合离子电导传导（MIEC）氧化物。然后，这种基本的理解可以鉴定出稳健（活跃和稳定的）氧化物为固体氧化电解细胞（SOEC）阴极的设计标准。 SOEC是高温，固态电解器，其特征是高效率和独特的可扩展性。在这个项目中，检查了氧化物层中的异质性，该氧化物层的异质性改变了其表面的局部电场并与SOEC的性能相关，并阐明了组成对MIEC氧化物降低的影响。这些知识用于定义可靠的MIEC-CATHODE SOEC的设计标准。增强下一代学生教育的活动，包括两组学生之间的夏季研究交流计划，以及与丰田研究中心的合作伙伴关系，该研究中心将学生暴露于工业研究环境，并提供学术界基本工作之间的联系并在行业中的应用，确保该项目的广泛影响。该奖项反映了NSF的法定任务，并被认为是使用基金会的知识分子优点和更广泛影响的评论标准的评估值得支持的。

项目成果

Elucidating the Role of B-Site Cations toward CO 2 Reduction in Perovskite-Based Solid Oxide Electrolysis Cells

阐明 B 位阳离子对基于钙钛矿的固体氧化物电解池中 CO 2 还原的作用

• DOI: 10.1149/1945-7111/ac5e9b
• 发表时间: 2022
• 期刊: Journal of The Electrochemical Society
• 影响因子: 3.9
• 作者: Tezel, Elif;Guo, Dezhou;Whitten, Ariel;Yarema, Genevieve;Freire, Maikon;Denecke, Reinhard;McEwen, Jean-Sabin;Nikolla, Eranda
• 通讯作者: Nikolla, Eranda