在混合导电薄膜表面上的晶体导向依赖氧气交换动力学由实地研究研究
Matthäus Siebenhofer1,2, Christoph Riedl1, Andreas Nenning1
1Institute of Chemical Technologies and Analytics, Vienna University of Technology, Vienna 1060, Austria.
ACS applied energy materials
|June 30, 2023
概括
兰石 (LSC) 薄膜表现出快速的氧气交换,但 (001) 方向高度易受酸性杂质的性能降解,形成硫酸盐吸附物.
科学领域:
- 材料科学 材料科学 材料科学
- 表面化学 表面化学
- 电化学 电化学 电化学
背景情况:
- 兰石 (La0.6Sr0.4CoO3-δ,LSC) 是固体氧化物电池电极的一个有希望的材料.
- 了解表面化学和氧气交换动力学对于优化LSC性能至关重要.
- 晶体定向对LSC表面特性的影响需要进一步研究.
研究的目的:
- 为了研究不同晶体学方向的LSC薄膜的氧气交换动力学和表面化学.
- 为了确定酸性气态杂质对LSC表面特性和性能的影响.
- 阐明晶体方向在LSC易受表面中毒的作用.
主要方法:
- 在脉冲激光沉积 (i-PLD) 过程中进行现场阻抗光谱,以研究氧交换动力学.
- 近环境压力X射线光电子光谱 (NAP-XPS) 用于分析表面化学.
- 工作功能测量以评估表面变化.
主要成果:
- 纯净的LSC表面表现出快速的氧气交换动力学,没有明显的取决于方向的差异.
- 在接触酸性杂质时, (001) LSC 导向显著更容易形成硫酸吸附物.
- 在 (001) LSC 上的硫酸盐吸附导致工作功能增加和加速性能降低.
结论:
- LSC的 (001) 方向特别容易受到由酸性杂质表面中毒引起的性能损失的影响.
- 这种针对硫酸盐吸附剂的定向特异性敏感性可能在以前对LSC的研究中被忽视.
- 这些发现对基于LSC的电极在固体氧化物电池中的设计和应用具有重要意义,考虑到多孔材料的复杂表面性质.
相关概念视频
01:06Interfacial Electrochemical Methods: Overview
289
Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
289
02:58Crystal Field Theory - Octahedral Complexes
26.9K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.9K