Hou Keke, Lou Chenjie, Tang Mingxue, Cao Hujun, Liu Laijun, Xu Jungu
MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, College of Materials Science and Engineering, Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources, Guilin University of Technology, Guilin, Guangxi 541004, China.
Center for High Pressure Science and Technology Advanced Research, Beijing 100193, China.
Inorg Chem. 2024 Sep 23;63(38):17727-17739. doi: 10.1021/acs.inorgchem.4c02571. Epub 2024 Sep 11.
Ruddlesden-Popper (RP)-structured materials based on transition metals with a variable valence, such as Fe, Mn, Ni, and so on, have been well documented for their potential of being used as electrodes in solid-oxide fuel cells. However, RP materials with pure or dominant ionic conduction are rare. Here, a series of Zr-based RP materials SrZrMO (M = Ga, Y, In) with electrical conductivity as high as 3.25 × 10 S cm at 900 °C in air was reported, which represents the highest conductivity for the Zr-based RP materials and is comparable to that of the recently reported In-based RP oxide-ion conductors, such as NdBaInO-based and LaBaInO-based materials. Under low oxygen partial pressure (O), the doped samples show pure ionic conducting behaviors without n-type electronic conductivity. The defect formation energies, local structure around the oxygen vacancies, and oxide-ion-conducting mechanism of the acceptor-doped SrZrO-based materials were studied for the first time. The results revealed a two-dimensional oxide ion migration characteristic within the perovskite slabs. This work therefore provides a good reference for developing new oxide-ion conductors in the Zr-based RP-structured materials.
基于具有可变价态的过渡金属（如铁、锰、镍等）的Ruddlesden-Popper（RP）结构材料，因其在固体氧化物燃料电池中用作电极的潜力而有充分的文献记载。然而，具有纯离子传导或主要离子传导的RP材料很少见。在此，报道了一系列Zr基RP材料SrZrMO（M = Ga、Y、In），在空气中900℃时电导率高达3.25×10 S cm，这代表了Zr基RP材料的最高电导率，并且与最近报道的基于In的RP氧化物离子导体（如基于NdBaInO和LaBaInO的材料）相当。在低氧分压（O）下，掺杂样品表现出纯离子传导行为，没有n型电子传导。首次研究了受主掺杂的SrZrO基材料的缺陷形成能、氧空位周围的局部结构以及氧化物离子传导机制。结果揭示了钙钛矿板内的二维氧化物离子迁移特性。因此，这项工作为在Zr基RP结构材料中开发新型氧化物离子导体提供了很好的参考。
