原子稳定基于Pt的金属间纳米粒子
Zhongliang Huang1,2, Yingru Wang3, Jing Xia4
1State Key Laboratory for Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
Science advances
|October 4, 2024
概括
研究人员开发了一种"原子"策略,以防止在高温催化中以为基础的纳米粒子聚合. 这种方法显著提高了氧气还原反应和燃料电池的性能,在长时间使用中保持活性.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 电化学 电化学 电化学
背景情况:
- 基于的纳米粒子 (NP) 对于催化是至关重要的,但在操作条件下容易聚合和烧结.
- 稳定这些NP对于保持催化活性和耐用性至关重要.
研究的目的:
- 为在高温下稳定- (PtCo) 纳米粒子 (NP) 制定一个强大的战略.
- 为了提高PtCo NP的催化性能,用于氧降解反应 (ORR) 和燃料电池应用.
主要方法:
- 引入了一个"原子"概念,涉及M-N-C材料和Pt-M-N协调.
- 用各种金属 (Zn,Mn,Fe,Ni,Co,Cu) 测试该策略的多功能性,以稳定基于Pt的NP.
- 评估稳定NP在氧降解反应和燃料电池循环中的性能.
主要成果:
- 在高温下使用"原子"策略证明了稳定的PtCo NP结构.
- 在ORR与g-Zn-N-C/PtCo.相比,获得了2.99 A mgPt-1的质量活性 (MA).
- 在燃料电池中经过9万个循环后,维持了初始MA的79.3%,显示出出色的耐用性.
结论:
- "原子"策略为稳定基于Pt的NP提供了一种多功能和有效的方法.
- 这种方法显著提高ORR和燃料电池的催化性能和耐用性.
- 预计这些发现将激发人们对各种应用稳定金属纳米粒子的广泛兴趣.
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