在PEMFC应用中利用可控脱-支持合用于超稳定的PtNi催化剂
Fei Guo1, Manxi Gong1, Longxiang Liu2
1Department of Chemistry, University College London, London, UK.
Angewandte Chemie (International ed. in English)
|February 10, 2026
概括
研究人员开发了一种用于燃料电池的新型PtNi纳米粒子催化剂. 这种持久的催化剂显著提高了质子交换膜燃料电池中的氧降解反应活性和性能.
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:
- 过渡金属 (PtM) 合金是质子交换膜燃料电池 (PEMFC) 的关键氧降解反应 (ORR) 催化剂.
- 挑战包括过渡金属溶解,颗粒粗化和耐久性差,通常由于常规策略中的聚合而恶化.
研究的目的:
- 为PEMFCs开发一种耐用且高性能的PtNi催化剂.
- 通过防止纳米粒子聚合和提高稳定性来克服传统合金方法的局限性.
主要方法:
- 使用可控制的合金-脱合金策略,制造PtNi纳米颗粒,限制在一个N-化碳框架内 (Pt1Ni1-x@Nix_NC).
- 用氨酸辅助的脱产生了富含Pt的外和合金核心,释放的Ni原子被N-doped碳固定为Ni-N/C部分.
- 分析了这种协调支持合对电子结构和ORR动力学的影响.
主要成果:
- Pt1Ni1-x@Nix_NC催化剂实现了0.932V的高半波潜力和2.028A mgPt-1的质量活性,比商业Pt/C高8.75倍.
- 经过3万次循环后,只有6mV半波电位损失证明了特殊的耐用性.
- 在PEMFC中,燃料电池达到975mW cm-2的峰值功率密度,并保持了91.9%的初始性能.
结论:
- 合金-脱合金策略有效地抑制聚合并增强金属支相互作用,优化ORR动力学.
- 这种方法为下一代PEMFCs设计耐用,高性能,低组金属 (PGM) 催化剂提供了一种可通用的方法.
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