原子尺度洞察到可逆氧存储在氧化瓦纳薄膜中的原子尺度洞察
Ghada Missaoui1, Piotr Igor Wemhoff1, Niklas Nilius1
1Carl von Ossietzky University Oldenburg, Institute of Physics, D-26111, Oldenburg, Germany.
概括
金上的单层氧化物薄膜可以可逆地储存氧气,在V2O3和V2O5组成之间变化. 这项研究揭示了涉及异质催化氧存储的原子结构.
科学领域:
- 表面科学是一门学科.
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 在Pt(111) 上的氧化瓦纳薄膜显示可逆的氧气静脉测量.
- 了解氧气储存机制对于异质催化是至关重要的.
研究的目的:
- 在Pt上的VOx膜中研究可逆氧吸收过程中的原子层结构变化.
- 在模型催化系统中阐明氧气储存的微观途径.
主要方法:
- 射线光电子光谱 (XPS) 用于量化氧存储容量.
- 低温扫描道显微镜 (LT-STM) 用于原子分辨率成像.
- 电子衍射用于结构分析.
主要成果:
- 薄膜在缺乏氧气 (V2O3) 和富含氧气 (V2O5) 阶段之间切换.
- 氧的结合最初会在蜂格子上形成瓦纳基基.
- 富含氧气的阶段具有出现的V6O12环和无序的O-V-O三层.
结论:
- 这项研究揭示了VOx/Pt中的可逆氧存储的微观机制.
- 这项工作为与异质催化相关的氧气动力学提供了基本的见解.
相关概念视频
Properties of Transition Metals
25.8K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
25.8K
Voltammetry: Stripping Methods
214
Anodic Stripping Voltammetry (ASV), Cathodic Stripping Voltammetry (CSV), and Adsorptive Stripping Voltammetry (AdSV) are electrochemical techniques used to determine trace amounts of analytes in solution. These methods involve applying a potential to an electrode and measuring the resulting current.
Anodic Stripping Voltammetry (ASV)
ASV is used to determine metals and metalloids at trace levels. It involves two steps: deposition and stripping. First, a negative potential is applied to the...
Anodic Stripping Voltammetry (ASV)
ASV is used to determine metals and metalloids at trace levels. It involves two steps: deposition and stripping. First, a negative potential is applied to the...
214


