疏水性修饰增强了性聚合物电解质燃料电池中催化剂层的微观结构稳定性
Jun Ma1, Hualong Ma1, Jiayi Lin1
1School of Chemistry and Chemical Engineering, In situ Center for Physical Sciences, Shanghai Electrochemical Energy Device Research Center (SEED), Global Institute of Future Technology, Shanghai Jiao Tong University Shanghai 200240 China xupengtao@sjtu.edu.cn lwchen2018@sjtu.edu.cn.
RSC advances
|August 26, 2024
概括
将聚四乙烯 (PTFE) 颗粒添加到性聚合物电解质燃料电池 (APEFC) 中,可以提高耐用性. 这种修改改善了水资源管理,并保持了催化剂层的微观结构,大大提高了燃料电池的性能和寿命.
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
- 化学工程是化学工程的重要组成部分.
背景情况:
- 性聚合物电解质燃料电池 (APEFC) 面临着耐用性挑战,尽管功率密度高.
- 已知改善催化剂层的疏水性可以减少性能退化.
- 连接疏水性与催化剂层稳定性的微观机制尚未完全理解.
研究的目的:
- 研究水性在APEFC催化剂层微结构稳定性中的作用.
- 通过结合聚四乙烯 (PTFE) 颗粒来提高APEFC的耐用性.
- 阐明PTFE对催化剂层稳定性的作用背后的微观机制.
主要方法:
- 用PTFE修饰的催化剂层制造的膜电极组件 (MEAs).
- 性能测试包括当前步骤测试和当前电压极化曲线.
- 在耐久性测试后,使用场辐射扫描电子显微镜 (FE-SEM) 进行微结构分析.
主要成果:
- 用PTFE修改的MEAs显示稳定电压平台和降低歇斯底里.
- 使用PTFE修改的燃料电池在电化学耐用性上增加了45%以上.
- FE-SEM分析显示,在PTFE修饰的催化剂层中,孔隙减少和组件聚合较少.
结论:
- 嵌入PTFE有效地管理催化剂层中的多余水.
- 由PTFE促进的疏水性促进了稳定的催化剂层微观结构.
- 这项研究提供了一种实际的方法,通过了解微观结构机制来提高APEFC的耐用性.
相关概念视频
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