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. 2018 Feb 1;18(2):426. doi: 10.3390/s18020426

Figure 1.

Figure 1

Equivalent circuit model of (a) non-faradaic spectroscopy and (b) faradaic spectroscopy. CPE (Cdl) is a constant phase element that represents a double layer capacitance, Rs is a solution resistance and Rct is a charge transfer resistance, respectively.