Structural, electronic and chemical properties of low-index high-entropy alloy surfaces

低指数高熵合金表面的结构、电子和化学性能

• 批准号: 535729384
• 负责人: Professor Dr. Thomas Seyller
• 金额: --
• 依托单位: Institut Jean Lamour
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/535729384?language=en
• 关键词: Structural; electronic; chemical; properties; low

High-entropy alloys (HEAs) are discussed for applications in the fields of corrosion and wear protection as well as electrocatalysts. Although the surface properties of HEAs play a central role in these applications, they are still largely unexplored. In this project, the properties of low-index (100), (110) and (111) surfaces of the high entropy alloy CoCrFeNi are investigated in detail. Optimized epitaxial layers are used, which are produced by magnetron sputtering on single-crystalline substrates. The surface structures are characterized by low energy electron diffraction, low energy electron microscopy and scanning probe microscopy. The chemical composition of the surfaces is determined by X-ray photoelectron spectroscopy. The dispersion of electronic surfaces states that may occur is elucidated using angle-resolved photo-electron spectroscopy. In addition to the physical properties of the various low-index surfaces, their adsorption behavior with respect to oxygen and water will also be determined. Furthermore, the surfaces will be used in electrochemical studies. In particular, the different orientations will be compared with respect to their catalytic properties in the hydrogen evolution reaction.

高熵合金（HEAs）在腐蚀和磨损保护以及电催化剂领域的应用进行了讨论。虽然HEAs的表面性质在这些应用中起着核心作用，但它们在很大程度上仍未被探索。本项目对高熵合金CoCrFeNi的低指数（100）、（110）和（111）面的性质进行了详细的研究。使用优化的外延层，其通过磁控溅射在单晶衬底上产生。用低能电子衍射、低能电子显微镜和扫描探针显微镜对表面结构进行了表征。表面的化学组成由X射线光电子能谱法测定。可能发生的电子表面状态的分散使用角分辨光电子能谱阐明。除了各种低折射率表面的物理性质外，还将确定它们对氧和水的吸附行为。此外，这些表面将用于电化学研究。特别是，不同的取向将比较其在析氢反应中的催化性能。