On a distributed parameter model for electrical impedance of ionic polymer
On a distributed parameter model for electrical impedance of ionic polymer
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DOI：
10.1117/12.715554
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发表时间：
2007-04
期刊：
影响因子：
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通讯作者：
K. Takagi;Y. Nakabo;Zhiwei Luo;K. Asaka
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文献类型：
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作者：
K. Takagi;Y. Nakabo;Zhiwei Luo;K. Asaka
从测量的频率响应来看，IPMC的阻抗具有分布参数系统的特征。特别是在TEA离子的情况下，我们发现频率响应不能用简单的理想电容近似，甚至不能用低阶传递函数来近似。在这项研究中，我们从频率响应的角度讨论了IPMC电气系统的黑盒电路建模。我们采用了一些传递函数不合理的模型。这样的模型之一是分布式电路(传输线)。另一种是含有分布参数元件(恒定相位元件)的黑盒电路模型。这两个传递函数都由‘S’的平方根组成。在实验中，测量了镀金Nafion(镀金Nafion)在电极夹尺寸和两种阳离子(Na离子和TEA离子)条件下的电阻抗。结果表明，电极夹持条件对测量阻抗的影响较小。然而，我们观察到阻抗高度依赖于阳离子物种。从实验频率响应中辨识出模型的参数。TEA盒比Na盒具有更大的电阻和更小的电容元件。所确定的参数与茶离子运动慢于钠离子的物理直觉是一致的。
From the observation of the measured frequency response, the electrical impedance of IPMC has the characteristics of a distributed parameter system. Especially in the case of TEA ion, we found that the frequency response cannot be approximated by a simple ideal capacitor or even by low-order transfer functions. In this study, we discuss a black-box circuit modeling of the electrical system of IPMC from the point of view of the frequency response. We employ some models whose transfer functions are not rational. One of such models is a distributed circuit (transmission line). Another is a black-box circuit model with a distributed parameter element (constant phase element). Both transfer functions consist of square root of 's'. In the experiment, the electrical impedance of an IPMC (gold plated Nafion) is measured under some conditions such as electrode clamp sizes and two cation species, Na ion and TEA ion. From the result, we found that the electrode clamp condition less affects the measured impedance. However, we observed that the impedance highly depends on the cation species. From the experimental frequency response, the parameters of the model are identified. Larger resistance and smaller capacitive element are identified in TEA case than those in Na case. The identified parameters are consistent with the physical intuition that TEA ion movement is slower than Na ion.