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Citation: ZHAO Yong-Tao, YAN Jin-Chen. Filtering of Electrochemical Transients by Empirical Mode Decomposition Method[J]. Acta Physico-Chimica Sinica, ;2008, 24(01): 85-90. doi: 10.3866/PKU.WHXB20080115 shu

Filtering of Electrochemical Transients by Empirical Mode Decomposition Method

1.
SunRui Corrosion and Fouling Control Company, Qingdao 266071, Shandong Province, P. R. China; State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266071, Shandong Province, P. R. China; Department of Electronics, Ocean University of China, Qingdao 266071, Shandong Province, P. R. China

Received Date: 13 August 2007
Available Online: 26 November 2007

A filtering method based on empirical mode decomposition (EMD) for coulostatically-induced transients (CITs) was presented. The effect of EMD filtering was evaluated from different simulation systems. To boost the applicable solution for EMD filtering and reduce the subjectivity of filtering, discussions of the simulating noises were mainly focused on white noise, high frequency noise, 50 Hz noise from commercial power and blend of above-mentioned noises. To illustrate the most importance of EMD filtering for the odness of fit of CIS, one real corrosion system involving multi-time constant was simultaneously investigated by electrochemical impedance spectrum (EIS) and coulostatically-induced spectrum (CIS). The results reported here demonstrate that EMD de-noising is applicable for CITs. The proposed method shows od performance of de-noising and is an alternative de-noising method for the CITs analysis. CIS with EMD filtering are in od agreement with EIS. For practical application of EMD, removal of the first two items of intrinsic mode function (IMF) and 50 Hz element in forth IMF will be generally satisfactory for CIS analysis.
- Empirical mode decomposition; Transient response; Coulostatic; Filtering; Non-stationary
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