高硫化聚乙基与Cu2+结合,作为零度以下温度下的质子交换膜
Xu Li1, Libing Qian2, Dongwei Zhang1
1Key Laboratory of Nuclear Solid-State Physics Hubei Province, School of Physics and Technology, Wuhan University, Wuhan 430072, China.
Journal of colloid and interface science
|June 2, 2024
概括
与铜离子 (Cu2+) 协调的硫化聚乙乙 (SPEEK) 膜在低温下显示出增强的质子导电性和机械强度. 这些SPEEK-Cu膜为零度以下燃料电池应用提供了更好的防性能.
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
- 聚合物科学 聚合物科学
背景情况:
- 在低温下提高质子交换膜 (PEM) 的质子导电性对于扩大燃料电池应用至关重要.
- 硫化聚乙乙 (SPEEK) 膜具有高质子导电性,但机械强度较差,胀较高.
- 由于离子流动性降低和水结,低温显著阻碍了传统PEM的性能.
研究的目的:
- 开发基于SPEEK的新型膜,增强低温质子导电性和机械稳定性.
- 为了研究铜离子 (Cu2+) 协调对SPEEK膜的性能的影响.
- 评估这些修改膜在零度以下燃料电池应用中的潜力.
主要方法:
- 用不同的硫化度制备SPEEK膜.
- 通过化制造Cu2+协调的SPEEK (SPEEK-Cu) 膜.
- 膜性质的表征,包括离子交换能力,吸水能力,机械强度和质子导电性.
- 使用低温差异扫描热量计 (LT-DSC) 量化水态.
- 在零度以下温度下对燃料电池的性能评估.
主要成果:
- 高硫化SPEEK膜具有高质子导电性 (0.074 S/cm在-25°C),但机械性能差.
- 与原始的SPEEK相比,SPEEK-Cu膜保留了高-SO3H含量,显示出更好的机械强度和尺寸稳定性.
- 在SPEEK-Cu膜下,在-25°C时的质子导电率为0.054 S/cm,在-10°C时的燃料电池最大功率为0.42 W/cm2.
- LT-DSC分析显示,SPEEK-Cu膜中的结合水有助于抗性能,在零度以下的温度下减缓性能衰变.
结论:
- 铜离子协调有效地提高了SPEEK膜的机械性能和尺寸稳定性,同时保持了良好的质子导电性.
- SPEEK-Cu膜表现出优越的低温性能和抗特性,性能优于其他报告的材料.
- 像Cu2+-SPEEK这样的复合膜对实际的零下燃料电池应用具有重大前景.
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