Pt装饰的PdCo@Pd/C核心外纳米颗粒具有增强的稳定性和电催化活性,用于氧降解反应
Deli Wang1, Huolin L Xin, Yingchao Yu
1Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States.
Journal of the American Chemical Society
|November 26, 2010
概括
一种新的,具有成本效益的方法为燃料电池准备了增强的-核心外纳米颗粒. 这些催化剂显示出更好的稳定性和甲醇耐受性对于氧降解反应 (ORR).
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:
- 开发高效的电催化剂对于推进燃料电池技术至关重要.
- 目前的催化剂的高成本和有限的稳定性,如碳上的 (Pt/C),阻碍了广泛采用.
- 氧降解反应 (ORR) 是燃料电池中的一个关键过程,需要有效和耐用的催化剂.
研究的目的:
- 开发一种简单,可扩展和具有成本效益的方法来制备PdCo@Pd核心纳米粒子.
- 为了提高这些纳米粒子的稳定性和电催化活性,用于氧降解反应 (ORR).
- 研究Pt装饰的PdCo@Pd纳米催化剂作为燃料电池的潜在阴极材料的性能,重点关注甲醇耐受性.
主要方法:
- 在碳支器上制备PdCo@Pd核心外纳米粒子,利用吸附剂诱导的表面分离效应.
- 通过自发位移反应,用少量的 (Pt) 装饰PdCo@Pd纳米粒子.
- 对氧降解反应 (ORR) 合成的纳米催化剂的电催化评估,包括与商业Pt/C催化剂相比,对稳定性和甲醇耐受性的评估.
主要成果:
- 成功建立了一种生产PdCo@Pd核心纳米颗粒的简单且可扩展的方法.
- 使用Pt的装饰显著提高了ORR的PdCo@Pd纳米颗粒的稳定性和电催化活性.
- 由此产生的PdCo@Pd和Pt装饰的PdCo@Pd纳米催化剂与传统的Pt/C催化剂相比,表现出更好的甲醇耐受性.
结论:
- 开发的吸附剂诱导表面分离方法为先进的纳米催化剂提供了低成本的大规模生产途径.
- Pt装饰的PdCo@Pd核心外纳米颗粒显示出作为燃料电池的高度稳定和活性阴极催化剂的有希望的潜力.
- 减少加载和提高性能使这些纳米催化剂成为未来燃料电池应用的可行替代品.
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