The Cause Analysis of the Incomplete Semi-Circle Observed in High Frequency Region of EIS Obtained from TEL-Covered Pure Copper

摘要

The occurrence of the incomplete capacitive semi-circle in the high frequency region ofelectrochemical impedance spectra was studied using thin electrolyte layer-covered two-electrodesystem. Thin electrolyte layer was made by evenly depositing NaCl particles onto the electrode surfaceo and subsequently exposing to humid pure air with relative humidity of 84% and 25 C. The incompletecapacitive semi-circle in the high frequency region was observed in low NaCl deposition density andin longer exposure duration of high NaCl deposition density. The occurrence of this incompletecapacitive semi-circle is decided by the nonuniformity of the current distribution on the electrodesurface.