在高性能聚合物电解质燃料电池加速压力测试后揭示了局部衰老模式
Preetam Sharma1, Lei Cheng2, Douglas Aaron1
1Electrochemical Energy Storage and Conversion Laboratory, Department of Mechanical, Aerospace and Biomedical Engineering, University of Tennessee, Knoxville, TN, 37919, USA.
Small (Weinheim an der Bergstrasse, Germany)
|December 2, 2023
概括
这项研究揭示了燃料电池膜电极组件在各种应力测试下如何不同老化. 碳腐蚀导致严重的退化,而颗粒的增长对电流分布的影响较小.
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
- 化学工程是化学工程的重要组成部分.
背景情况:
- 膜电极组件 (MEAs) 是燃料电池中的关键组件.
- 了解异质老化模式对于改善燃料电池耐用性至关重要.
研究的目的:
- 在不同的加速应力测试 (AST) 条件下分析MEA中异质衰老.
- 调查碳腐蚀 (CC AST) 和 (Pt) 颗粒生长 (Pt AST-湿,Pt AST-干) 对MEA性能的影响.
主要方法:
- 使用多式联运特征技术.
- 检查了电流分布的变化和Pt粒子大小图.
- 经过模拟碳腐蚀和Pt颗粒大小增长条件的MEA.
主要成果:
- 对于每个AST病例,观察到不同的当前分布模式.
- CC AST导致了显著的电流梯度的严重性能下降.
- Pt AST-Wet和Pt AST-Dry显示空间电流分布的微小变化,尽管有不同的Pt粒子增长.
- 在蛇形流场曲线下,在Pt AST-Wet中观察到偏好的Pt粒子增长.
结论:
- 大众运输特性显著影响燃料电池性能和耐用性.
- 超出电化学活性表面积 (ECSA) 的因素对于评估燃料电池耐用性至关重要.
- 不同质的衰老机制因AST条件而异.
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