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在复杂金属间Al13Fe4中探测单个Pt原子
Tsunetomo Yamada1, Takayuki Kojima1,2, Eiji Abe3
1Institute of Multidisciplinary Research for Advanced Materials (IMRAM) , Tohoku University , 2-1-1 Katahira, Aoba-ku , Sendai 980-8577 , Japan.
Journal of the American Chemical Society
|March 7, 2018
概括
在铁合金 (Al13Fe4) 中的白金原子替代铁. 表面单个原子在化中表现出减少的活性,受结合的影响.
科学领域:
- 材料科学
- 固态化学
- 催化剂
背景情况:
- 像Al13Fe4这样的复杂金属合金具有独特的电子和结构性质.
- 单原子催化是材料科学的前沿, 提供高效率和选择性.
- 了解当地的原子环境对于设计有效的单原子催化剂至关重要.
研究的目的:
- 为了研究 (Pt) 单个原子的原子结构和位置偏好,将其入单体Al13Fe4.
- 评估 Al13Fe4 中单个 Pt 原子的催化性能.
- 阐明局部原子结构和单原子Pt的催化活性之间的关系.
主要方法:
- 使用Czochralski方法的Al13Fe4单晶生长.
- 高角环状暗场扫描传输电子显微镜 (HAADF-STEM) 用于原子分辨率成像.
- 单晶X射线衍射 (SC-XRD) 用于精确的结构确定.
主要成果:
- 原子在Al13Fe4矩阵中成功分散为单个原子,取代了铁位点.
- 在Fe () 位点观察到Pt的强烈偏好替代.
- 与Al2Pt和散装Pt相比,表面单原子Pt位点在化中表现出较低的活性和选择性.
结论:
- 精确确定了Pt-合Al13Fe4的原子结构,揭示了单原子分散和Fe(1) 位置偏好.
- 单原子Pt的催化性能受到其局部协调环境的显著影响,特别是与周围的原子的结合.
- 这些发现为复杂金属合金中的单原子催化剂的结构-活性关系提供了关键的见解.
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