用于高效电催化醇氧化的Pd@Pt核心外纳米颗粒的干诱导晶格扩张
Guigao Liu1,2, Wei Zhou3, Yiru Ji4
1Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China.
Journal of the American Chemical Society
|July 20, 2021
概括
研究人员设计了催化剂,在特定的方面扩展了晶格,大大提高了酒精氧化反应. 这种方法提高了催化剂的性能,并提供了对面依赖催化物的洞察力.
科学领域:
- 材料科学
- 电化学
- 纳米技术
背景情况:
- 对提高金属催化剂性能和理解反应机制至关重要.
- 在特定的催化剂晶体面上控制格子参数仍然是一个重大挑战.
研究的目的:
- 在 (Pt) 催化剂的特定面 (Pt100和Pt111) 上开发一个简单的格子扩张方法.
- 研究面特异性格子扩张对酒精氧化反应 (AOR) 的影响.
- 阐明导致催化活性增强的潜在机制.
主要方法:
- 通过Pd-seeded表层生长的Pd@Pt核心外纳米粒子形成的两步合成.
- 间隔将Pd核心转换为PdH0.43,从而诱导Pt外中的晶格扩张.
- 酒精氧化反应 (AOR) 的电化学评估和密度功能理论 (DFT) 的计算.
主要成果:
- 在Pt催化剂的Pt100) 和Pt111) 方面取得了成功的晶格扩张.
- 在两个扩展的Pt方面显著促进了酒精氧化反应 (AOR) 的活性.
- 与商业Pt/C相比,Pt质量特定活性在甲醇氧化时是41.15倍,在乙醇氧化时是25.19倍.
结论:
- 在Pt催化剂的特定方面进行格子扩张有效地增强了AOR的电催化活性.
- 提高性能是由于OH吸附的改善,正如DFT计算所证实的那样.
- 这项工作通过面特异性晶格工程设计和制备高效纳米材料催化剂提供了一个有希望的策略.
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