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: 1929306
• 负责人: Jean-Sabin McEwen
• 金额: $ 28.93万
• 依托单位: Washington State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-08-15 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1929306&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：高温电化学装置是新型高效能源转换系统所需的关键元件。例如，固体氧化物电解池可以通过蒸汽电解提供氢气。或者，正如本工作所设想的那样，这样的系统还可以从蒸汽和二氧化碳中提供合成气（一氧化碳和氢气）。这种复杂的系统运行效率高，并且可以使用从间歇性电源获得的电力。然而，它们的性能需要适当的优化以避免退化。最近的工作表明，混合离子电子导电氧化物基阴极表现出良好的活性和稳定性，这有利于在进料中使用纯二氧化碳。然而，对这些氧化物如何处理二氧化碳的基本了解仍然有限。在这个项目中，PI Nikolla 和 McEwen 将实验和理论相结合，以确定混合离子电子导电陶瓷材料如何与二氧化碳相互作用以促进其加工。正在制定用于识别固体氧化物电解池环境中坚固（活性和稳定）氧化物阴极的设计标准。 PI Nikolla 和 McEwen 还通过培训研究生和本科生积极参与外展活动，这些学生通常在工业界或学术界找到工作。研究团队还通过与丰田研究中心的互动与业界合作。因此，这项研究让学生接触到工业研究环境，使他们能够看到学术界基础工作与工业应用之间的联系。技术细节：实验和理论技术相结合，形成对混合离子电子导电 (MIEC) 氧化物上 CO2 电化学还原的基本了解。这种基本的理解使得能够定义识别坚固（活性和稳定）氧化物作为固体氧化物电解池（SOEC）阴极的设计标准。 SOEC 是高温固态电解槽，具有高效率和独特的可扩展性。在该项目中，研究了氧化物层中的异质性（它改变了其表面的局部电场并与 SOEC 的性能相关），并阐明了成分对 MIEC 氧化物还原性的影响。这些知识用于定义稳健的 MIEC 阴极 SOEC 的设计标准。加强下一代学生教育的活动，包括两个学生群体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，让学生接触工业研究环境，并在学术界的基础工作和工业应用之间建立联系，确保了该项目的广泛影响。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进行评估，被认为值得支持 标准。

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