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首页> 外文期刊>Advanced Functional Materials >A Critical Revision of the Nano-Morphology of Proton Conducting lonomers and Polyelectrolytes for Fuel Cell Applications
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A Critical Revision of the Nano-Morphology of Proton Conducting lonomers and Polyelectrolytes for Fuel Cell Applications

机译：燃料电池应用中质子传导离聚物和聚电解质的纳米形态的重要修订

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摘要

A few aspects of the nano-morphology of hydrated Nafion and other ionomers and polyelectrolytes in their acid form are revisited by examining the evolution of small angle X-ray scattering (SAXS) data which are recorded for a wide range of water volume fractions (Φ_(water) ≈ 7-56 vol%). A consistency check with the recent "parallel cylinder model" discloses that this is most likely biased by a large uncertainty of the experimentally determined water content. We rather find our data to be consistent with locally flat and narrow (around 1 nm) water domains. The formation of relatively thin water "films" is suggested to be a common feature of many ionomers and polyelectrolytes, and the underlying driving force is most likely electrostatics within these highly dissociated systems. The water films may act as a charged (e.g., with positive protonic charge carriers) "glue", keeping together the oppositely charged polymer structures. While this interaction tends to produce flat morphologies, the formation process is suggested to be constraint by limited conformational degrees of freedom of the corresponding polymer and the interactions between polymer backbones. This may leave severe tortuosities on larger scales which depend on the sample history (including swelling, de-swelling, aging, stretching, and pressing).
机译：通过检查小角度X射线散射（SAXS）数据的演变，回顾了水合Nafion和其他离聚物和酸形式的聚电解质的纳米形态的一些方面，这些数据记录了各种水体积分数（Φ_ （水）≈7-56％（体积）。与最近的“平行圆柱模型”进行的一致性检查显示，这很可能是由于实验确定的水含量存在较大不确定性而产生偏差。我们宁愿发现我们的数据与局部平坦和狭窄（约1 nm）的水域相一致。相对较薄的水“膜”的形成被认为是许多离聚物和聚电解质的共同特征，而潜在的驱动力很可能是这些高度离解的系统中的静电。水膜可充当带电的（例如，带有正质子电荷载体）“胶”，将相反带电的聚合物结构保持在一起。虽然这种相互作用趋于产生平坦的形态，但建议形成过程受到相应聚合物的有限构象自由度和聚合物主链之间相互作用的限制。这可能会在更大范围内留下严重的曲折，具体取决于样品的历史记录（包括膨胀，消肿，老化，拉伸和挤压）。

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  • 来源
    《Advanced Functional Materials》 |2013年第43期|5390-5397|共8页
  • 作者

    Klaus-Dieter Kreuer; Giuseppe Portale;

  • 作者单位

    Max-Planck-lnstitut fur Festkorperforschung Heisenbergstrasse 1, D-70569 Stuttgart, Germany;

    DUBBLE, BM26 at ESRF, 6 rue Jules Horowitz, BP220 F-38043 Grenoble, France;

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