作为电解质中氧化的高活性电催化剂的BCC相PdCu合金
1Department of Chemical and Biological Engineering , Iowa State University , 618 Bissell Road , Ames , Iowa 50011 , United Sates.
Journal of the American Chemical Society
|November 7, 2018
概括
开发高效的阳极催化剂对于离子交换膜燃料电池至关重要. 用BCC相成的PdCu合金纳米粒子显示氧化反应 (HOR) 活性提高了20倍,提供了一个有前途的解决方案.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 阳离子交换膜燃料电池 (AEMFC) 需要高效的阳极催化剂,用于性介质中的氧化反应 (HOR).
- 目前的阳极催化剂面临着由于性电解质的HOR动力学缓慢而造成的挑战,阻碍了AEMFC的性能和成本效益.
研究的目的:
- 合成和表征BCC阶段的铜 (PdCu) 合金纳米粒子作为AEMFC的潜在阳极催化剂.
- 研究晶体结构对电解质中PdCu纳米颗粒的HOR活性的影响.
主要方法:
- 用湿化学合成PdCu合金纳米粒子,然后进行临界热处理.
- 在现场高能X射线衍射 (HE-XRD) 分析晶体结构转换.
- 密度函数理论 (DFT) 计算以了解表面结合特性.
主要成果:
- 与FCC相对应的PdCu纳米粒子的质量和特定HOR活动增加了20倍.
- 在性电解质中,BCC- PdCu的HOR活性明显高于Pd/ C和Pt/ C催化剂.
- DFT计算显示了BCC-PdCu表面的优化H和OH结合强度,类似于Pt.
结论:
- PdCu合金纳米颗粒的BCC晶体结构是提高基介质中HOR活性的关键.
- 优化H和OH结合可以协同提高催化性能,使BCC-PdCu成为AEMFC的有前途的阳极催化剂.
- 这项研究通过晶体结构转换提供了一种新的催化剂开发方法,以实现高效的HOR催化.
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