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. 2021 Jun 15;21(12):4110. doi: 10.3390/s21124110

Figure 7.

Figure 7

(a) EIS curves obtained with the sensor at 4 acidic pH values as example, (b) equivalent circuit used to determine electrochemical parameters, (c) double layer capacitance, (d) solution resistance and (e) charge transfer resistance variation of the electrochemical sensor with pH values.