完全化六角矿相关氧化物的八面体层中的高质子导电
Kohei Matsuzaki1, Kei Saito1, Yoichi Ikeda2
1Department of Chemistry, School of Science, Tokyo Institute of Technology, 2-12-1-W4-17, O-okayama, Meguro-ku, Tokyo 152-8551, Japan.
Journal of the American Chemical Society
|June 25, 2024
概括
新的六角矿相关氧化物显示出高质子导电性和化学稳定性. 这些材料对燃料电池和传感器来说是有前途的,因为它们具有独特的结构和水分特性.
科学领域:
- 材料科学
- 固态化学
- 电化学
背景情况:
- 质子导体对于燃料电池,电解电池和传感器等能源应用至关重要.
- 现有的材料往往缺乏足够的质子导电性和中间温度的化学稳定性.
- 开发新的质子导体材料对于推进这些技术至关重要.
研究的目的:
- 合成和描述一个新的六角矿相关氧化物Ba5RE2Al2SnO13 (RE=Gd,Dy,Ho,Y,Er,Tm,Yb).
- 评估这些新材料的质子导电性和化学稳定性.
- 了解材料结构,水分和质子传输特性之间的关系.
主要方法:
- 六角矿相关氧化物的合成.
- 中子衍射和热重量测量分析以确定结构和水合性质.
- 在各种大气条件下测量导电性,以评估质子导电性和化学稳定性.
主要成果:
- 在没有使用剂的情况下,Ba5Er2Al2SnO13表现出高质子导电性 (在303°C时为0.01 S cm−1).
- 高质子导电性归因于高质子度 (完全水和氧空位) 和八面体层中的快速质子迁移.
- 在潮湿的O2,空气,H2和CO2大气中,Ba5Er2Al2SnO13表现出极好的化学稳定性.
结论:
- 由于其高导电性和稳定性,Ba5Er2Al2SnO13被认为是优越的质子导体.
- 六角矿相关氧化物 (Ba5RE2Al2SnO13) 系列显示出高质子导电性的潜力.
- 开发具有高氧缺陷的六角矿相关材料,具有高效的水合和质子迁移,是下一代质子导体的一个有希望的策略.
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