用表面丰富的单双原子定制Pt纳米环,用于具有超低Pt负载的直接甲醇燃料电池
Xiaokun Fan1,2, Wen Chen3, Lei Xie3
1Bay Area Center for Electron Microscopy, Songshan Lake Materials Laboratory, Dongguan, 523808, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|February 14, 2024
概括
在纳米环 (SE-Bi1/Pt NRs) 上,表面丰富的单个珠原子显著增强了甲醇氧化催化. 这一进步为高效的直接甲醇燃料电池 (DMFC) 提供了一个有希望的途径.
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
- 催化剂是一种催化剂.
背景情况:
- (Pt) 的单原子装饰通过最大限度地增加活性位点来增强催化性能.
- 在Pt表面上实现高密度的单原子装饰带来了重大设计挑战.
研究的目的:
- 开发表面丰富的单个Bi-原子定制的Pt纳米环 (SE-Bi1/Pt NRs) 以改善甲醇氧化.
- 以DFT计算为指导,研究Bi密度在促进无碳路径和加速HCOOH形成动力学方面的作用.
主要方法:
- 从PtBi金属间纳米板开始,定制合成SE-Bi1/Pt NRs.
- 使用蚀刻和回火处理来实现密集的单个Bi-atom装饰.
- 密度函数理论 (DFT) 的计算指导了合理的设计.
主要成果:
- SE-Bi1/Pt NRs在性电解质中表现出23.77 A mg-1 Pt的质量活性,用于甲醇氧化.
- 实现的活动分别是Pt-Bi NR和商业Pt/C的2.2倍和12.8倍.
- 启用直接甲醇燃料电池 (DMFC) 具有高功率密度 (85.3 mW cm-2) 和超低 Pt 负载 (0.39 mg cm-2).
结论:
- 开发的SE-Bi1/Pt NRs对甲醇氧化具有异常的催化性能.
- 这一进步凸显了SE-Bi1/Pt NRs作为高性能DMFC的实用阳极电催化剂的潜力.
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