The electric properties of an electrode can be evaluated by the determination of the capacitance. However, the literature reports a large panel of experimental protocols for capacitance determination, which involve either cyclic voltammetry (CV) or electrochemical impedance spectroscopy (EIS). Indeed, substantial discrepancies in the assumptions are made between both techniques as in CV, the system is usually considered as ideal (and the current-scan rate relationship is assumed to remain linear at all frequencies), whereas in EIS, the system is usually considered as non-ideal and a CPE element is introduced. In this work, the electric properties of two electrode configurations, namely an Au blocking electrode and an Al electrode with a thin oxide film were investigated using EIS and CV. The capacitive domain was determined for both systems assuming the presence of an ideal and non-ideal system. The results collected from CV revealed a limited linearity between the current and scan rate for both electrode configurations. Finally, a CPE element was introduced to determine the capacitance from CV data and compared to EIS results.

可以通过确定电容来评估电极的电性能。然而，文献报道了用于电容确定的大量实验规程，其涉及循环伏安法（CV）或电化学阻抗谱（EIS）。确实，两种技术之间的假设存在很大差异，例如在CV中，该系统通常被认为是理想的（并且电流扫描速率关系被认为在所有频率下都保持线性），而在EIS中，该系统通常被认为是由于不理想，因此引入了CPE元素。在这项工作中，使用EIS和CV研究了两个电极结构的电学性能，即具有薄氧化膜的Au阻挡电极和Al电极。假设存在理想和非理想系统，两个系统都确定了电容域。从CV收集的结果表明，两种电极配置的电流和扫描速率之间的线性有限。最后，引入了CPE元件以根据CV数据确定电容，并将其与EIS结果进行比较。