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Moving Ion Fronts in Mixed Ionic-Electronic Conducting Polymer Films

机译：混合离子电子导电聚合物薄膜中的移动离子前沿

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The aim of this paper is to analyze moving front dynamics of ions and holes in a planar, mixed ionic-electronic conducting polymer film. As cations invade the film, holes evacuate; thus, an ionic current is converted to an electronic signal. Recent experiments show that the location of the advancing ion front increases as the square-root of time, a scaling typically associated with diffusive transport, which is surprising given the large driving voltages utilized. Ionic and electronic transport is modeled via the drift-diffusion equations. A similarity transformation reduces the governing partial differential equations to ordinary differential equations that are solved numerically. The similarity transformation elucidates the origin of the square-root-of-time front scaling. The similarity solution is then compared to the numerical solution of the full drift-diffusion equations, finding excellent agreement. When compared with experimental data, our model captures the front location; however, qualitative differences between the ion profiles are observed. (C) 2015 American Institute of Chemical Engineers
机译：本文的目的是分析平面，混合离子电子导电聚合物薄膜中离子和空穴的运动前沿动力学。阳离子侵入薄膜时，空穴会疏散;因此，离子电流被转换为电子信号。最近的实验表明，前进离子前沿的位置随时间的平方根增加，这通常与扩散传输有关，这在使用大驱动电压的情况下是令人惊讶的。离子和电子传输通过漂移扩散方程建模。相似变换将控制性偏微分方程简化为数值求解的常微分方程。相似性变换阐明了时间平方根前缩放的起源。然后将相似度解与完整的漂移扩散方程的数值解进行比较，发现极好的一致性。当与实验数据进行比较时，我们的模型会捕获前端位置;但是，观察到离子分布之间存在质的差异。 （C）2015美国化学工程师学会

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