ABSTRACT

To check the reproducibility of electrochemical impedance spectroscopy (EIS) measurements, 19 laboratories have performed round-robin (RR) testing on EIS using various instruments and three different systems: a dummy cell and two electrochemical systems of practical interest in the nuclear corrosion domain. The general conclusion drawn from the tests performed with the dummy cell is that the actual commercially available instruments for EIS measurements are suitable to produce good quality data. Differences in the EIS diagrams for the tested electrochemical systems were observed and discussed. This RR exercise, involving for the first time a large number of laboratories, shows that intrinsic scatter (large or small) is present in the impedance data and that reproducibility should be readily checked. While EIS is an excellent technique for investigating the kinetics of electrochemical systems, great care has to be taken on planning and conducting the experiments. Recommendations are given to help obtaining reliable EIS results.

摘要

为了检查电化学阻抗谱（EIS）测量的可重复性，有19个实验室使用各种仪器和三个不同系统对EIS进行了循环（RR）测试：一个虚拟电池和两个在核腐蚀领域中具有实际意义的电化学系统。从使用虚拟电池进行的测试中得出的一般结论是，实际的市售EIS测量仪器适用于产生高质量的数据。观察并讨论了电化学测试系统的EIS图中的差异。这项RR练习首次涉及大量实验室，表明阻抗数据中存在固有散射（大或小），并且应容易检查重现性。尽管EIS是研究电化学系统动力学的出色技术，但在计划和进行实验时必须格外小心。给出建议以帮助获得可靠的EIS结果。