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补水指纹:一种可复制的协议,用于在阳离子交换膜中准确吸收水分

Sandra Elisabeth Temmel¹, Daniel Ölschläger¹, Ralf Wörner¹

¹Institute of Sustainable Energy Technology and Mobility (INEM), University of Applied Sciences Esslingen, 73037 Göppingen, Germany.

|September 26, 2025

概括

一个新的标准化协议增强了离子交换膜 (AEM) 吸水量测量,提供了精确的"水化指纹". 这种方法提高了AEM设计和工业部署的准确性,这对于下一代能源技术至关重要.

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
膜技术膜技术膜技术

背景情况:

离子交换膜 (AEM) 对于接近工业准备的催化剂涂层膜至关重要.
准确的吸水数据对于AEM设计至关重要,但目前的方法缺乏可重复性 (>20%的变化率).
传统的重力测量方法遭受手动抹杀和未定义的干燥,导致显著的测量分散.

研究的目的:

开发一个标准化,精确的协议来测量AEM吸水量.
为了为AEMs建立可重复的"水化指纹".
提供一个预测工具包,用于将水含量与关键绩效指标相关联.

主要方法:

采用了校准的压力擦拭装置 (0.44 N cm-2,10 s,两次) 来取代手动擦拭.
使用减弱总反射率-福里埃变换红外光谱 (ATR-FTIR) 来验证干湿膜状态.
开发了一种低成本的盐浴方法,用于对强化和非强化膜的蒸汽相吸附分析.

主要成果:

新的协议大大减少了FAAM-PK-75膜的水吸收测量中的散射.
结果与各种媒体 (DI水,KOH,酒精) 和湿度水平 (39-96% RH) 的公布基准保持一致.
确定了影响水分的关键因素:OH^-选,热密集 (60°C) 和PEEK强化.

结论:

建立了AEM水合测试的新基准,提高了准确性和可比性.
该协议在各种AEM类型中显示了广泛的适用性.
开发的工具包有助于根据含水量,导电性和稳定性预测AEM性能.

关键词:

在ATR-FTIR中使用.离子交换膜的离子交换膜补水指纹的指纹标准化涂抹方式 (blotting)水的吸收吸收水

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