通过 Pt-In 双位点离合途径进行断裂活动-稳定性权衡,以实现高度持久的氧气减少
Dongping Xue1, Junke Li1, Jianliang Cao1
1College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, China.
Journal of colloid and interface science
|December 23, 2025
概括
研究人员在缺陷丰富的碳上开发了超小的- (Pt3In) 合金纳米粒子. 这种新型催化剂提高了燃料电池的氧降解反应 (ORR) 性能和稳定性.
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
- 纳米技术纳米技术
背景情况:
- 基于小尺寸订制 (Pt) 的合金对于改善氧降解反应 (ORR) 中的活性稳定性权衡至关重要.
- 现有的催化剂面临的挑战包括3D过渡金属脱金属化,站点阻断和恶劣条件下的副作用.
研究的目的:
- 为ORR设计和合成了一种基于Pt的超小订制合金催化剂,其活性和稳定性得到了增强.
- 为了研究设计的催化剂的催化机制和耐用性.
主要方法:
- 合成超小的订购Pt3In合金纳米颗粒 (2.7纳米) 限制在缺陷丰富的碳 (Pt3In/DC).
- 在酸性电解质中进行电化学测试,以评估催化活性和稳定性.
- 现场光谱和密度函数理论 (DFT) 计算以阐明反应机制.
主要成果:
- Pt3In/DC催化剂在0.9V时表现出1.36A mgPt-1的高质量活性,是商业Pt/C的7.1倍.
- 经过加速测试后,表现出极好的稳定性,只有4mV半波潜在衰变和96.2%的质量活动保留.
- DFT计算显示,转向直接分离的O2吸附途径,抑制H2O2的形成和缓解部位阻塞.
结论:
- Pt3In/DC催化剂有效地解决了ORR催化中的活动稳定性权衡.
- 利用低点和电子合的设计策略为高性能 Pt 基合金提供了可扩展的途径.
- 这一进步对质子交换膜燃料电池的商业化充满了希望.
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