在O2激活的Au/TiO2接口上操纵原子结构
Jiawei Huang1, Shuai He1, Justin L Goodsell1
1Department of Chemistry and Center for Catalysis, University of Florida, Gainesville, Florida 32611, United States.
Journal of the American Chemical Society
|March 24, 2020
概括
操纵金/二氧化接口的原子结构可以增强氧气的激活. 这种原子水平的理解优化了异质催化,以改善CO氧化活性.
科学领域:
- 材料科学
- 表面化学
- 催化科学
背景情况:
- 金属/氧化物接口对于异质催化是至关重要的,但其原子水平的机制尚不清楚.
- 了解界面原子结构是控制催化活动的关键.
研究的目的:
- 研究金/二氧化 (Au/TiO2) 界面上的原子结构操纵如何影响电子分布和氧气激活.
- 阐明介面原子结构在CO氧化催化中的作用.
主要方法:
- 具有不同原子结构的Au/TiO2接口的制造和表征 (无缺陷与富含氧气空隙).
- 现场光谱分析以探测电子交界和氧分子相互作用.
- 测量CO氧化活动以量化催化性能.
主要成果:
- 无缺陷的Au/TiO2接口可促进电子从Ti3+转移到Au纳米粒子,然后转移到O2,形成Au-O-O-Ti物种并增强O2激活.
- 富含氧气空位的Au/TiO2接口在氧气空位 (Vo) 捕获电子,阻碍O2的激活,并导致显著降低CO氧化活性 (约2%) 这样一来,
- 化处理可以从界面Vo释放被困的电子,从而促进O2激活.
结论:
- 金属/氧化物界面的原子结构决定了界面电子分布和催化活性.
- 优化接口原子结构,例如创建无缺陷接口,是增强异质催化的一种有希望的策略.
- 这项研究为设计高效的催化剂提供了原子级机械学的理解.
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