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化伊米达作为无水燃料电池膜的质子载体
Wei-Qiao Deng1, Valeria Molinero, William A Goddard
1Materials and Processing Simulation Center, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.
Journal of the American Chemical Society
|December 2, 2004
概括
一个新的三化胺浸的Nafion膜为质子交换膜燃料电池提供了高温,无水的操作. 计算测试显示导电性良好,没有电极中毒,克服了类似材料的关键限制.
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
- 计算化学计算化学
背景情况:
- 质子交换膜燃料电池 (PEMFCs) 需要可靠的膜才能高效运行.
- 目前的膜通常需要水来实现质子导电性,限制了高温应用.
- 现有的与伊米达浸的膜受到电极中毒的影响.
研究的目的:
- 引入和评估一种新的2,4,5-trifluoroimidazole浸的Nafion材料.
- 评估其作为PEMFCs的高温无水膜的潜力.
- 研究其与电极的相互作用,以防止中毒.
主要方法:
- 使用分子动力学 (MD) 和量子力学 (QM) 技术进行计算测试.
- 在高温下估计质子导电性.
- 对2,4,5-trifluoroimidazole与表面的结合亲和力的分析.
主要成果:
- 预计质子导电率在177°C时大约为0.06S/cm.
- 证明了2,4,5-trifluoroimidazole与表面的弱结合.
- 表示没有预期的电极中毒.
结论:
- 2,4,5-trifluoroimidazole浸的Nafion是高温,无水的PEMFC的一个有希望的材料.
- 该材料克服了与传统的伊米达膜相关的电极中毒问题.
- 需要进一步的研究来验证这些计算发现的实验性验证.
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