一个双金属策略调节电子金属支相互作用在基于Co3O4(111) 的催化剂:支持Rh-Pt核心外纳米粒子的案例
Jonas Hauner1, Alexander Simanenko1, Lukáš Fusek2
1Interface Research and Catalysis, ECRC, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen, Germany. yaroslava.lykhach@fau.de.
双金属- (Rh-Pt) 纳米粒子通过调整电子金属支相互作用 (EMSI) 来稳定可降解氧化物上的金属催化剂. 这防止了纳米粒子的分解,增强了催化剂的稳定性.
科学领域:
- 催化科学是一种催化科学.
- 材料科学 是一种材料科学.
- 表面化学 表面化学
背景情况:
- 电子金属支相互作用 (EMSI) 对催化剂性能至关重要,但可能导致纳米粒子不稳定.
- 在Rh/Co3O4(111) 系统中的强电荷转移导致Rh纳米粒子的氧化和分解.
- 控制EMSI是设计稳定和主动支持的贵金属催化剂的关键.
研究的目的:
- 为了研究双金属Rh-Pt相互作用如何调节Rh/Co3O4 ((111) 接口上的EMSI.
- 了解可降解氧化物支上的核心Rh-Pt纳米粒子的稳定机制.
- 为设计可减少氧化物的稳定催化剂提供策略.
主要方法:
- 在Co3O4的薄膜上制备核心Pt@Rh和Rh@Pt纳米颗粒.
- 使用同步子辐射光电子光谱学的研究.
- 分析电荷转移和纳米粒子稳定性的分析.
主要成果:
- 将Pt纳入Rh纳米粒子显著减弱了来自Co3O4的电荷转移.
- 无论是Pt@Rh还是Rh@Pt核心外结构都能稳定Rh纳米粒子,防止它们分解.
- 强大的Rh-Pt相互作用和二元相形成有助于纳米粒子稳定.
结论:
- 双金属相互作用有效调整EMSI,抵消有害的电荷转移.
- 核心外的Rh-Pt纳米粒子在可降解氧化物支上提供了增强的稳定性.
- 这项工作为设计电子平衡和热稳定的催化剂提供了基础.
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