混合导体的阻抗谱：氧化铈的二维研究
Impedance Spectra of Mixed Conductors: a 2D Study of Ceria
摘要：
在本文中，我们开发了一个分析框架的混合离子和电子导体（MIEC）的电化学阻抗的研究。该框架是基于第一性原理，它的特点是耦合的电化学反应，表面传输和散装运输过程。我们利用这项工作，分析二维系统相关的燃料电池科学通过有限元法（FEM）。在具有图案化金属电极的二维燃料电池样品上，在包括温度和$H_2$分压变化的广泛工作条件下，模拟了二氧化铈对称电池在接近平衡条件（零偏压）下的交流阻抗谱（IS）。该模型显示IS曲线与实验文献的阻抗上的相对误差一致低于2%。重要的二维效应，如厚度减小的影响和可变的电子和离子的扩散系数对阻抗谱的影响也进行了探讨。
英文摘要：
In this paper we develop an analytical framework for the study of electrochemical impedance of mixed ionic and electronic conductors (MIEC). The framework is based on first-principles and it features the coupling of electrochemical reactions, surface transport and bulk transport processes. We utilize this work to analyze two dimensional systems relevant for fuel cell science via finite element method (FEM). Alternate current Impedance Spectroscopy (IS) of a ceria symmetric cell is simulated near equilibrium condition (zero bias) for a wide array of working conditions including variations of temperature and $H_2$ partial pressure on a two dimensional fuel cell sample with patterned metal electrodes. The model shows agreement of IS curves with the experimental literature with the relative error on the impedance being consistently below 2%. Important two-dimensional effects such the effects of thickness decrease and the influence of variable electronic and ionic diffusivities on the impedance spectra are also explored.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
