在金属间Pt合金中引入电子缓冲器,以防止高性能燃料电池的表面极化
Xuan Liu1, Yuhan Wang2, Jiashun Liang1
1State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
Journal of the American Chemical Society
|January 11, 2024
概括
将等电子缓冲物引入-铁合金纳米颗粒可以提高燃料电池催化剂的稳定性和氧降低反应活性. 这种策略可以抑制表面极化和应变,从而提高性能和耐用性.
科学领域:
- 电化学
- 材料科学
- 纳米技术
背景情况:
- 在恶劣的电化学条件下,表面极化会破坏燃料电池中的基催化剂的稳定.
- 实现热力学稳定对于高性能燃料电池催化剂至关重要.
研究的目的:
- 开发一种抑制表面极化和增强 (Pt) 基催化剂的稳定性的策略.
- 研究用于燃料电池应用的金属间Pt合金纳米粒子催化剂中的电子缓冲器的作用.
主要方法:
- 在L10-M-PtFe结构中合成的金属间Pt合金纳米粒子催化剂具有可变价值金属电子缓冲器 (M = Ti,V,Cr,Nb).
- 运用X射线吸收光谱分析来研究不同电位下的电子结构变化.
- 使用密度函数理论 (DFT) 计算来理解表面应变和电荷转移效应.
主要成果:
- L10-Cr-PtFe/ C催化剂显著改善了氧降解反应 (ORR) 的活性和稳定性.
- 电子缓冲器,特别是 (Cr),促进了电子流向Pt外,减少了表面极化和拉伸应变.
- 在0.9V时达到1.41A mgPt-1的质量活动,额定功率密度为14.0W mgPt-1,在60,000次循环后电压损失最小.
结论:
- 将电子缓冲器引入L10-PtFe金属间纳米粒子是提高催化剂稳定性和活性的一种有效策略.
- 增强的ORR性能归因于优化的表面应变和Cr到Pt外的电荷转移.
- 这些发现为燃料电池的耐用性和高性能催化剂的开发提供了有前途的途径.
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