通过机械合成获得的LaSrAl1-xMgxO4-δ分层矿的结构和电气特性
Carlos Mariño1, Daniel Serafini1, Juan Basbus2
1Departamento de Física, Universidad de Santiago de Chile, Avenida Libertador Bernardo O'Higgins nº 3363, Estación Central, Santiago 9170124, Chile.
Materials (Basel, Switzerland)
|December 23, 2023
概括
这项研究介绍了K2NiF4类型的分层矿,这些矿是通过机械化学方法为固体氧化物燃料电池合成的. 的结合显著提高了离子导电性,为先进的能量存储提供了一个有前途的途径.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 陶制品 在陶方面.
背景情况:
- 固体氧化物燃料电池 (SOFC) 需要高效的氧化物离子电解质.
- 电解质的传统合成方法可能对环境有害,耗时.
- K2NiF4型分层矿是SOFC电解质的潜在候选者.
研究的目的:
- 为了在结构和电气上描述用于SOFC应用的LaSrAl1-xMgxO4-δ矿.
- 研究Mg替代对相位形成和离子导电性的影响.
- 探索机械化学合成作为传统方法的替代方法.
主要方法:
- 机械化学合成 (球磨) 的拉斯尔Al1-xMgxO4-δ粉末.
- 用X射线衍射 (XRD) 进行相位分析和纯度测定.
- 传输电子显微镜 (TEM) 用于微观结构分析.
- 扫描电子显微镜 (SEM) 和能量分散式X射线光谱 (EDS) 用于杂质分析.
- 电化学阻抗光谱 (EIS) 用于电导度测量.
主要成果:
- 机械化学合成产生了具有晶体和无形区域的纳米粒子.
- 替代通过机械合成对相位形成产生了积极的影响.
- 具有x = 0.1的样品表现出>97%的相位纯度.
- 对于x = 0.2和0.3.3,观察到不纯度分离.
- 的结合使离子导电率提高了三倍.
- 在 900 °C 达到 1.6 mS/cm 的导电性,因为 x = 0.2.2.
结论:
- 机械化学合成是一种可行的,环保的途径,用于制备K2NiF4型矿.
- 兴奋剂显著提高了LaSrAl1-xMgxO4-δ的离子导电性.
- 对SOFC应用的密集化,杂质控制和机械/热性能需要进一步的研究.
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