A Method Developed for Getting Kinetic Information from Electrochemical Impedance Spectroscopy Measured for Anodized Ti in Fluoride

作者：Kong, De-Sheng^*; Kong, Wei-Qing; Feng, Yuan-Yuan; Li, Wen-Juan; Wei, Yu-Jie

来源：Journal of the Electrochemical Society, 2013, 160(10): C461-C466.

DOI：10.1149/2.016310jes

• IRREVERSIBLE ELECTRON TRANSFERS
• OXIDE-FILMS
• EQUIVALENT-CIRCUITS
• PASSIVE FILMS
• AC-IMPEDANCE
• GRAPHICAL ANALYSIS
• STEADY-STATE
• DISSOLUTION
• GROWTH
• DIFFUSION

EIS has been acknowledged to be a powerful tool for investigating the kinetic mechanisms of charge transfer processes at electrode/solution interfaces. The method of using equivalent electrical circuits (EECs) has been most frequently used for interpreting measured EIS spectra. But the mechanistic information that this method can deliver is very limited. In this work, an alternative but innovative method, which combines the EECs and the mechanism analysis, is developed. With anodically polarized, oxide film covered titanium in NaF-containing perchloric acid solutions as an example, a detailed procedure is described and discussed for obtaining kinetic information (such as the rate constant, rate-determining step) from the results estimated by EECs. Two double-step mechanism models for anodized titanium are proposed and tested based on the strategy of the developing approach.

• 出版日期2013
• 单位曲阜师范大学