在Pt/Ru燃料电池催化剂中对CO耐受性的NMR研究
YuYe Tong1, Hee Soo Kim, Panakkattu K Babu
1Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, USA.
Journal of the American Chemical Society
|January 17, 2002
概括
通过削弱-一氧化碳键,在催化剂上促进甲醇电氧化. 这项研究揭示了白金与白金-网站上的不同CO行为,提高了燃料电池中的CO耐受性.
科学领域:
- 电化学 电化学 电化学
- 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:
- 甲醇电氧化对于燃料电池技术至关重要.
- 催化剂被广泛使用,但容易受到CO中毒.
- 众所周知,在基催化剂中促进了CO耐受性.
研究的目的:
- 调查在促进甲醇电氧化对纳米级催化剂的作用.
- 使用先进的技术,阐明CO和/表面之间的相互作用.
- 了解Pt/Ru催化剂中增强的CO耐受性的机制.
主要方法:
- 固态电化学NMR (EC NMR),循环电量计 (CV) 和潜在静电电流的联合应用.
- 在纳米级和-合金催化剂上对CO物种的分析.
- 催化剂表面相互作用的光谱和电化学表征.
主要成果:
- 证据表明有两种不同的CO种群:在纯Pt上和在Pt/Ru岛上.
- 在Pt/Ru上的CO呈现出转移的NMR共振,较弱的Korringa放松和热激活的表面扩散.
- 两种二氧化碳种群之间没有观察到快速交换.
- 会削弱Pt-CO键,从而提高CO氧化率.
结论:
- 结合EC NMR/电化学方法为催化剂促进提供了新的见解.
- 鲁在Pt/Ru燃料电池催化剂中促进了CO耐受性的作用,以机理解释.
- 这种方法为研究异质催化中的促进提供了新的途径.
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