Using electrochemical impedance spectroscopy to compensate for errors when measuring polarisation curves during three-electrode measurements of solid oxide fuel cell electrodes
Using electrochemical impedance spectroscopy to compensate for errors when measuring polarisation curves during three-electrode measurements of solid oxide fuel cell electrodes
复制标题
使用电化学阻抗谱补偿固体氧化物燃料电池电极三电极测量极化曲线时的误差
DOI：
10.1016/j.electacta.2008.04.001
复制
发表时间：
2008
影响因子：
6.6
通讯作者：
N. Brandon
中科院分区：
文献类型：
--
作者：
G. Offer;P. Shearing;J. Golbert;D. Brett;A. Atkinson;N. Brandon
使用三电极技术，包括一个独立的参比电极是非常宝贵的，在确定固体氧化物燃料电池（SOFC）电极的过电位损失。然而，在SOFC中实现这种过电位的精确测量存在许多障碍。此外，电化学阻抗谱（EIS）通常用于分析SOFC电极上发生的过程，并且在建立用于开路条件下的EIS实验的可行的三电极技术方面已经进行了大量的工作。然而，目前为EIS实验开发的三电极技术不太适合于高负载或改变气体成分的条件;无论是有意还是在扩散限制条件下。本文报告了一种解决方案，为常用的颗粒细胞，减轻这些问题。本文提出了一种方法，使用EIS来校正的误差时，测量工作电极过电位极化过程中所产生的偏移在电解质电流分布从初级到次级电流分布下的负载。这种技术使有意义的过电位计算使用实验简单的电池几何形状的条件下，他们通常不能被准确地测量。
The use of three-electrode techniques involving an independent reference electrode is invaluable in determining the overpotential losses at solid oxide fuel cell (SOFC) electrodes. However, there are numerous barriers to achieve the accurate measurement of such overpotentials in an SOFC. Furthermore electrochemical impedance spectroscopy (EIS) is commonly used to analyse the processes occurring on SOFC electrodes, and there has been considerable work in establishing viable three-electrode techniques for EIS experiments under open circuit conditions. However, the three-electrode techniques currently developed for EIS experiments are not well suited for conditions of high load, or changing gas compositions; either intentionally or under diffusion limiting conditions. This paper reports a solution for commonly used pellet cells, which mitigates these problems. The paper presents a method using EIS to correct for errors when measuring the working electrode overpotential during polarisation arising from a shift in the electrolyte current distribution from the primary to the secondary current distribution under load. This technique enables meaningful overpotentials to be calculated using experimentally simple cell geometries under conditions where they cannot normally be accurately measured.