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基于硫化PEEK的质子导电聚合物电解质膜和具有不同酸度的蛋白离子液体混合物

V Theußl¹, X Cui¹, H Hou¹

¹Institute of Energy Technologies - Electrochemical Process Engineering (IET-4), Forschungszentrum Jülich GmbH, 52425, Jülich, Germany.

Scientific reports

|October 9, 2025

概括

硫化聚乙基膜中的蛋白离子液体 (PIL) 对中温燃料电池具有前景. 这些新型膜提供了良好的热稳定性和高离子导电性,推进了燃料电池技术.

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
聚合物科学聚合物科学

背景情况:

蛋白离子液体 (PILs) 被探索为聚合物膜的替代品,用于质子导电解质.
中温质子交换膜燃料电池 (IT-PEMFCs) 需要稳定,高性能电解质,在100°C以上运行.

研究的目的:

为了研究两个特定的PILs,[DESPA][TfO]和[DEMA][TfO]的适用性,作为在硫化聚--- (sPEEK) 主体聚合物中的质子导体物种.
评估基于PIL的膜的热稳定性,离子导电性和性能,用于IT-PEMFC应用.

主要方法:

两种蛋白离子液体,N,N-二甲基-3-硫-1-三甲硫酸盐 ([DESPA][TfO]) 和二甲基三甲硫酸盐 ([DEMA][TfO]),在硫化聚乙基 (sPEEK) 基质中合成和固定.
准备了膜件,并进行了热稳定性测试,在120°C和40%相对湿度 (RH) 上测量了离子导电性,并分析了极化曲线以确定功率密度.

主要成果:

[DESPA][TfO]和[DEMA][TfO]两种内置的sPEEK膜都表现出高达200°C的良好热稳定性.
实现了高离子导电性,在120°C和40%的RH下达到高达5.28mS cm−1.
[DESPA][TfO]的最大功率密度为3.5mW cm-2和[DEMA][TfO]的最大功率密度为6.5mW cm-2,这表明燃料电池的性能非常有前途.

结论:

在sPEEK膜中固定的研究中的蛋白离子液体 ([DESPA][TfO]和[DEMA][TfO]) 适用于中温质子交换膜燃料电池 (IT-PEMFCs) 的聚合物电解质膜 (PEMs).
这些基于PIL的膜为先进的燃料电池应用提供了传统聚合物膜的可行替代方案.

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