CAREER: Processing High Surface Area, Nanostructured Ceramic Scaffolds at High Temperatures via In-Situ Carbon Templating of Hybrid Materials

职业：通过混合材料的原位碳模板在高温下加工高表面积纳米结构陶瓷支架

• 批准号: 1651186
• 负责人: Michael Gross
• 金额: $ 50万
• 依托单位: Wake Forest University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-03-15 至 2023-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1651186&HistoricalAwards=false
• 关键词: CAREER; Processing; Surface; Area; Nanostructured

This Faculty Early Career Development (CAREER) Program award investigates the formation of extremely high surface area nanostructured ceramic materials. Ceramic materials are widely used as electrodes and in highly efficient electrochemical technologies including solid oxide fuel cells, membrane reactors, gas separators, and energy storage systems. High surface area, nanostructured scaffolds are needed to maximize the efficiency of these technologies which rely on chemical reactions occurring on the surface of the ceramic scaffold. This award supports fundamental research to understand high temperature processing of hybrid inorganic-organic materials, which produce ceramic scaffolds with eighty times more surface area than traditional methods. This novel processing approach works for a wide range of hybrid materials and ceramics, providing a new platform for realizing new and improved ceramic scaffolds, composites, and electrodes. Successfully implementing them in electrochemical systems would transform a broad marketplace encompassing electrical power generation, production of value-added chemicals, gas separation, and renewable energy storage; all directly benefiting society. The educational component of this award supports measuring the positive impact of integrating research and teaching on student intrinsic motivation in STEM. A Science Olympiad outreach program for the lowest performing elementary school in North Carolina is also supported, which will get at-risk minority students excited about science and engineering at an early age, likely increasing their participation in STEM. The research objective is to test the hypothesis that ceramic scaffold surface area derived from in situ carbon templating of hybrid materials is limited by the degree of metal carbide impurity formation, and that this fundamental limitation can be overcome by controlling the processing gas environment. The research approach is to (1) systematically change the total amount of carbon generated in situ by modifying hybrid inorganic-organic materials, (2) quantify the amount of carbon template and metal carbide impurity present after thermal processing at different temperatures and gas compositions, and (3) correlate the carbon template and metal carbide impurity concentrations to the final ceramic scaffold surface area. Understanding the evolution and impact of the carbon template and metal carbide impurities on scaffold surface area, the fundamental limitations of this approach, and a pathway to overcome the limitations will provide the field with the critical ability to process high surface area, nanostructured ceramic scaffolds. The surface areas and nanomorphologies realized through this work will provide the research community access beyond the current design space for a wide range of applications.

该学院早期职业发展（CAREER）计划奖研究了极高表面积纳米结构陶瓷材料的形成。陶瓷材料广泛用作电极和高效电化学技术，包括固体氧化物燃料电池、膜反应器、气体分离器和能量存储系统。需要高表面积的纳米结构支架来最大化这些技术的效率，这些技术依赖于在陶瓷支架表面上发生的化学反应。该奖项支持基础研究，以了解混合无机-有机材料的高温加工，其生产的陶瓷支架比传统方法的表面积大80倍。这种新的加工方法适用于各种混合材料和陶瓷，为实现新的和改进的陶瓷支架，复合材料和电极提供了新的平台。在电化学系统中成功实施它们将改变一个广泛的市场，包括发电，增值化学品生产，气体分离和可再生能源储存;所有这些都直接造福社会。该奖项的教育部分支持衡量整合研究和教学对STEM学生内在动机的积极影响。北卡罗来纳州表现最差的小学的科学奥林匹克外展计划也得到了支持，这将使处于危险中的少数民族学生在很小的时候就对科学和工程感到兴奋，可能会增加他们对STEM的参与。本研究的目的是测试的假设，陶瓷支架的表面积来自原位碳模板的混合材料是有限的金属碳化物杂质形成的程度，这一根本性的限制，可以克服通过控制处理气体环境。研究方法是（1）通过改性混合无机-有机材料系统地改变原位产生的碳的总量，（2）量化在不同温度和气体组成下热处理后存在的碳模板和金属碳化物杂质的量，以及（3）将碳模板和金属碳化物杂质浓度与最终的陶瓷支架表面积相关联。了解碳模板和金属碳化物杂质对支架表面积的演变和影响，这种方法的基本限制以及克服这些限制的途径将为该领域提供处理高表面积纳米结构陶瓷支架的关键能力。通过这项工作实现的表面积和纳米形态将为研究界提供超越当前设计空间的广泛应用。

项目成果

The Impact of Sintering Atmosphere and Temperature on the Phase Evolution of High Surface Area LSCF Prepared by In Situ Carbon Templating

• DOI: 10.1149/1945-7111/abf062
• 发表时间: 2021-03
• 期刊: Journal of The Electrochemical Society
• 影响因子: 3.9
• 作者: S. Muhoza;Thomas H. Taylor;Xueyan Song;M. Gross

Processing Nano-YSZ in Solid Oxide Fuel Cells: The Effect of Sintering Atmosphere on Thermochemical Stability

固体氧化物燃料电池中纳米 YSZ 的加工：烧结气氛对热化学稳定性的影响

• DOI: 10.1149/2.0261902jes
• 发表时间: 2019
• 期刊: Journal of The Electrochemical Society
• 影响因子: 3.9
• 作者: Muhoza, S. P.;McCormack, A.;Garrett, R. W.;Yuce, M. D.;Prathab, V. S.;Hambright, S. K.;Cottam, M. A.;Gross, M. D.
• 通讯作者: Gross, M. D.

Enhancing Activity, Charge Transport, Power Production, and Stability of Commercial Solid Oxide Fuel Cells with Yttria-Stabilized Zirconia Nanoparticles

使用氧化钇稳定的氧化锆纳米颗粒增强商用固体氧化物燃料电池的活性、电荷传输、发电和稳定性

• DOI: 10.1149/1945-7111/ab6eed
• 发表时间: 2020
• 期刊: Journal of The Electrochemical Society
• 影响因子: 3.9
• 作者: Muhoza, Sixbert P.;Lee, Shiwoo;Song, Xueyan;Guan, Bo;Yang, Tao;Gross, Michael D.
• 通讯作者: Gross, Michael D.

High Surface Area SOFC Electrode Materials Prepared at Traditional Sintering Temperatures

• DOI: 10.1149/2.0381802jes
• 发表时间: 2018
• 期刊: Journal of The Electrochemical Society
• 影响因子: 3.9
• 作者: S. Muhoza;T. Barrett;M. Cottam;S. E. Soll;M. Yuce;V. S. Prathab;S. Hambright;M. Rezazad;O. Racchi;M. Gross

Lowering the Impedance of Lanthanum Strontium Manganite-Based Electrodes with Lanthanum Oxychloride and Lanthanum Scavenging Chloride Salts

用氯氧化镧和除镧氯化物盐降低锰酸锶镧基电极的阻抗

• DOI: 10.1149/1945-7111/ac359a
• 发表时间: 2021
• 期刊: Journal of The Electrochemical Society
• 影响因子: 3.9
• 作者: Taylor, Thomas H.;Muhoza, Sixbert P.;Gross, Michael D.
• 通讯作者: Gross, Michael D.