Impedance of constant phase element (CPE)-blocked diffusion in film electrodes
Impedance of constant phase element (CPE)-blocked diffusion in film electrodes
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DOI：
10.1016/s0022-0728(98)00115-6
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发表时间：
1998-07-30
影响因子：
4.5
通讯作者：
Bulhoes, LOS
中科院分区：
文献类型：
--
作者：
Bisquert, J;Garcia-Belmonte, G;Bulhoes, LOS
我们建立了一个阻抗图中低频区有倾斜的阻塞线性扩散的交流阻抗响应模型。该方法基于传输线与线性扩散的类比，它相当于求解匹克定律的边界条件，该边界条件允许我们在低频处设置任意阻抗响应。我们认为阻塞界面处的粗糙度在低频时会引起恒相元（CPE）响应，并且我们给出了一个阻抗模型函数，该函数可以在发现这种恒相元时沿整个频率范围拟合数据。这在Li（+）插入Nb(2)O(5)的实验中得到了验证。该模型对金属氧化物薄膜电极和改性聚合物电极具有一定的指导意义。(C) 1998 Elsevier Science S.A.版权所有
We construct a model of ac impedance response to blocked linear diffusion that has a sloped low frequency region in the impedance plot. The approach is based on the transmission line analogy to linear diffusion, and it is equivalent to solving Pick's law with a boundary condition that allows us to set an arbitrary impedance response at low frequencies. We argue that roughness at the blocking interface gives rise to constant phase element (CPE) response at low frequencies, and we give an impedance model function that can fit data along the whole frequency range when such a CPE is found. This is tested in an experiment of Li(+) insertion in Nb(2)O(5). The model should be of significance for metal oxide thin film electrodes and modified polymer electrodes. (C) 1998 Elsevier Science S.A. All rights reserved.