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多尺度揭示了真实催化剂层接口如何主导超低PEMFC中局部氧气运输阻力
Yangyang Chen1, Hao Lin2, Junlang Huo2
1Guangdong Provincial Key Laboratory of Fuel Cell Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China; School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China.
Journal of colloid and interface science
|May 30, 2024
概括
这项研究表明,低Pt催化剂表面的离子体分布不均会增加氧气运输阻力 (Rlocal). 均的离子体分布增强了电化学活性表面积 (ECSA) 并提高了燃料电池的性能.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 燃料电池中的低催化剂层 (CLs) 经常表现出高的局部氧 (O2) 运输阻力 (Rlocal).
- 了解控制Rlocal的因素对于提高催化剂层性能至关重要.
研究的目的:
- 为了研究真实催化剂层接口如何影响低Pt催化剂中的Rlocal.
- 阐明离子体分布,电化学活性表面积 (ECSA) 和Rlocal.com之间的关系.
主要方法:
- 采用了结合CO中毒,限制电流密度和电化学阻抗光谱的多项研究方法.
- 分析的重点是离子体分布及其对催化剂表面性能的影响.
主要成果:
- 发现催化剂表面上的离子体分布不均,与离子体含量没有直接相关.
- 电化学活性表面积 (ECSA) 与离子体覆盖率呈正相关性,表明离子体接触点是有效的.
- 均的离子体分布与改善的质子传输和减少的氧气扩散距离有关.
结论:
- 不均的离子体分布在低Pt催化剂层中显著导致Rlocal.
- 优化离子体分布是最大化ECSA和增强氧气运输的关键,从而减少Rlocal并改善燃料电池的整体性能.
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