当前位置: X-MOL 学术Chem. Rec. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Development of Melilite‐Type Oxide Ion Conductors
The Chemical Record ( IF 6.6 ) Pub Date : 2020-07-30 , DOI: 10.1002/tcr.202000069
Lijia Zhou 1 , Jungu Xu 1 , Mathieu Allix 2 , Xiaojun Kuang 1, 3
Affiliation  

Lowering the operating temperature of solid oxide fuel cells (SOFCs) requires high performance oxide ion conductor electrolytes. Recently tetrahedra‐based structures have been attracting considerable attention for oxide ion conductor development, among which the layered tetrahedral network melilite structure appears particularly interesting owing to its remarkable capability to accommodate and transport interstitial oxide ions, compared with isolated tetrahedral anion structures. Stabilization and migration mechanisms of interstitial oxide ions in melilites have been systematically investigated using local structural relaxation from both electrostatic Coulomb interaction and chemical bonding aspects based on atomic and electronic structures respectively using experimental and theoretical approaches. These reveal cationic size and chemical bonding effects on stabilization and migration mechanisms of interstitial oxide ions. Lately, full crystallization from glass, an innovative synthesis method, was employed to produce new metastable melilite oxide ion conductors which are inaccessible using classic solid state reaction owing to cationic size effect. Finally, the thermal and chemical stability at low temperature and the high oxide ion conductivity of the best melilite oxide ion conductors based on LaSrGa3O7 are likely to provide real possibilities of applications of melilite‐type electrolytes in SOFCs and other related devices.

中文翻译:

Melilite型氧化物离子导体的开发

降低固体氧化物燃料电池(SOFC)的工作温度需要高性能的氧化物离子导体电解质。近来,基于四面体的结构已经引起了氧化物离子导体发展的广泛关注,其中层状的四面体网状分子结构与孤立的四面体阴离子结构相比,由于其具有显着的容纳和传输间隙性氧化物离子的能力而显得特别有趣。利用原子和电子结构分别基于静电库仑相互作用和化学键合方面的局部结构弛豫,分别通过实验和理论方法,系统地研究了分子筛中间隙质氧化物离子的稳定和迁移机理。这些揭示了阳离子尺寸和化学键合效应对间质氧化物离子的稳定和迁移机理的影响。最近,从玻璃中完全结晶,这是一种创新的合成方法,被用于生产新的亚稳的硅铝石氧化物离子导体,由于阳离子的尺寸效应,使用经典的固态反应无法获得这种导体。最后,基于LaSrGa的最佳莫来石氧化物离子导体的低温热稳定性和化学稳定性以及高氧化物离子电导率3 O 7可能为将硅镁石型电解质应用于SOFC和其他相关设备提供真正的可能性。
更新日期:2020-07-30
down
wechat
bug