用Pt3Ti纳米粒子氧化燃料的电催化性能
Hideki Abe1, Futoshi Matsumoto, Laif R Alden
1Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, USA. abe.hideki@nims.go.jp
Journal of the American Chemical Society
|March 29, 2008
概括
- (Pt3Ti) 纳米粒子被合成为直接燃料电池的电催化剂. 原子排序的Pt3Ti纳米颗粒在氧化酸和甲醇中表现出优异的性能,同时减少了CO吸附.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 纳米技术纳米技术
背景情况:
- 直接燃料电池需要高效的电催化剂来氧化燃料.
- 基材料被广泛使用,但人们正在寻找替代品来提高性能和降低成本.
- - (Pt3Ti) 合金显示出作为先进的电催化剂的潜力.
研究的目的:
- 为了合成和表征- (Pt3Ti) 纳米粒子.
- 评估Pt3Ti纳米颗粒用于酸和甲醇氧化的电催化活性.
- 为了比较Pt3Ti纳米粒子与纯和-催化剂的性能.
主要方法:
- 通过减少Pt(1,5-环氧) Cl2和Ti(四) 2Cl4.4.的原子失序的Pt3Ti纳米颗粒的合成.
- 在400°C以上的化过程中,将无序的纳米粒子转化为有序的Pt3Ti纳米粒子.
- 对酸和甲醇氧化的纳米粒子性能进行电化学评估,包括开始电位和电流密度测量.
- 碳化合物吸附研究以评估催化剂中毒耐药性.
主要成果:
- 与纯Pt或Pt-Ru相比,无序和有序的Pt3Ti纳米颗粒表现出较低的甲酸和甲醇氧化开始潜力.
- Pt3Ti纳米颗粒显示出明显较低的CO吸附亲和力比纯的Pt或Pt-Ru.
- 原子有序的Pt3Ti纳米粒子实现了比纯Pt,Pt-Ru或无序的Pt3Ti更高的酸和甲醇的氧化电流密度.
- 合成的纳米粒子大小约为3nm (无序) 和37nm (有序).
结论:
- Pt3Ti纳米粒子,特别是原子有序的形式,是直接燃料电池的有希望的阳极催化剂.
- 订购Pt3Ti的增强的催化活性和CO耐受性表明燃料电池效率有所提高.
- 对Pt3Ti纳米粒子优化的进一步研究可能会导致直接甲醇和酸燃料电池技术的进步.
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