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首页> 外文期刊>Journal of the Physical Society of Japan >Morphology Effect on Proton Dynamics in Nafion (R) 117 and Sulfonated Polyether Ether Ketone
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Morphology Effect on Proton Dynamics in Nafion (R) 117 and Sulfonated Polyether Ether Ketone

机译：形态对Nafion（R）117和磺化聚醚醚酮中质子动力学的影响

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摘要

We report results of our experimental and theoretical studies on the dynamics of proton conductivity in Nafion (R) 117 and self-fabricated sulfonated polyether ether ketone (SPEEK) membranes. Knowing that the presence of water molecules in the diffusion process results in a lower energy barrier, we determined the diffusion barriers and corresponding tunneling probabilities of Nafion (R) 117 and SPEEK system using a simple theoretical model that excludes the medium (water molecules) in the initial calculations. We then propose an equation that relates the membrane conductivity to the tunneling probability. We recover the effect of the medium by introducing a correction term into the proposed equation, which takes into account the effect of the proton diffusion distance and the hydration level. We have also experimentally verified that the proposed equation correctly explain the difference in conductivity between Nafion (R) 117 and SPEEK. We found that membranes that are to be operated in low hydration environments (high temperatures) need to be designed with short diffusion distances to enhance and maintain high conductivity.
机译：我们报告了我们对Nafion（R）117和自制的磺化聚醚醚酮（SPEEK）膜中质子电导率动力学的实验和理论研究的结果。知道扩散过程中水分子的存在会导致较低的能垒，我们使用简单的理论模型（排除了介质中的（水分子））确定了Nafion（R）117和SPEEK系统的扩散势垒和相应的隧穿概率。初始计算。然后，我们提出了一个将膜电导率与隧穿概率相关的方程。我们通过将校正项引入拟议的方程中来恢复介质的影响，该方程考虑了质子扩散距离和水合水平的影响。我们还通过实验验证了所提出的方程式正确解释了Nafion（R）117和SPEEK之间的电导率差异。我们发现要在低水合环境（高温）下运行的膜需要设计成具有较短的扩散距离，以增强并保持高电导率。

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