Understanding equilibrium and non-equilibrium dopant segregation towards more stable electrode materials

了解平衡和非平衡掺杂剂偏析以获得更稳定的电极材料

• 批准号: 18K13992
• 负责人: ハリントン ジョージ
• 金额: $ 2.66万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Early-Career Scientists
• 财政年份: 2018
• 资助国家: 日本
• 起止时间: 2018-04-01 至 2022-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-18K13992/
• 关键词: oxides; thin films; segregation; surfaces; grain boundaries

As part of this research project, we have been investigating the effects of interfaces for the development of advanced components for solid oxide fuel cells (SOFCs) and solid oxide electrolyser cells (SOECs). We demonstrated that the number of point defects, which is critical for both anion and cation diffusion, can be manipulated at interfaces often present in electrodes for SOEC/SOFC devices. By fabricating nanostructures of proto-typical electrode materials, we were able to tailor the concentration of oxygen vacancies and, therefore, the transport properties.Furthermore, it was demonstrated that by controlling the lattice strain present in thin film systems, the mobility of such defects could be manipulated as a function of strain, migration direction, and defect-defect interactions.Finally, it was shown that the surface exchange of a mixed-ionic electronic conducting material, a potential candidate for solid oxide fuel cell electrodes, could be modified by up to seven orders of magnitude by infiltrating binary oxides onto the surface. Interestingly, the change in surface exchange was directly correlated to the acidity of the infiltrated oxide.

作为该研究项目的一部分，我们一直在研究界面对固体氧化物燃料电池（SOFC）和固体氧化物电解槽电池（SOEC）先进组件开发的影响。我们证明了点缺陷的数量，这是至关重要的阴离子和阳离子的扩散，可以操纵在界面处经常存在于电极的SOEC/SOFC设备。通过制造原型电极材料的纳米结构，我们能够调整氧空位的浓度，从而调整输运性质。此外，还证明了通过控制薄膜系统中存在的晶格应变，可以操纵这些缺陷的迁移率作为应变、迁移方向和缺陷-缺陷相互作用的函数。最后，已经表明，混合离子电子传导材料（固体氧化物燃料电池电极的潜在候选物）的表面交换可以通过将二元氧化物渗透到表面上而被改性高达7个数量级。有趣的是，表面交换的变化与渗透氧化物的酸度直接相关。

项目成果

Electro-chemo-mechanical coupling in rare-earth substituted ceria: the effects of grain boundaries, interfaces, strain, and defect-interactions

稀土替代二氧化铈中的电化学机械耦合：晶界、界面、应变和缺陷相互作用的影响

• 发表时间: 2020
• 作者: Kaoru Shibata;Tsunetomo Yamada;Marc de Boissieu;G. F. Harrington
• 通讯作者: G. F. Harrington

Acidity of surface-infiltrated binary oxides as a sensitive descriptor of oxygen exchange kinetics in mixed conducting oxides

• DOI: 10.1038/s41929-020-00520-x
• 发表时间: 2020-10-05
• 期刊: NATURE CATALYSIS
• 影响因子: 37.8
• 作者: Nicollet, Clement;Toparli, Cigdem;Tuller, Harry L.
• 通讯作者: Tuller, Harry L.

New insights into strain-modified oxygen mobility in rare-earth substituted ceria: migration direction and defect association

对稀土取代二氧化铈中应变改性氧迁移率的新见解：迁移方向和缺陷关联

• 发表时间: 2021
• 作者: T. Yamada;Y. Nakamura;T. Watanuki;A. Machida;M. Mizumaki;K;Nitta;A. Sato;Y. Matsushita;A.P. Tsai;G. F. Harrington
• 通讯作者: G. F. Harrington

Electro-chemo-mechanics in substituted ceria: Modifying charge carrier concentration and mobility

取代二氧化铈中的电化学力学：改变载流子浓度和迁移率

• 发表时间: 2019
• 作者: G. F. Harrington;S. Greisshammer;L. Sun;S. Kim;N. Perry;B. Yildiz;K. Sasaki;H. L. Tuller
• 通讯作者: H. L. Tuller

RWTH Aachen(ドイツ)

亚琛工业大学（德国）