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Nyquist plots for 5.0 mmol L−1 equimolar mixture of K3[Fe(CN)6]/K4[Fe(CN)6] in 0.1 mol L−1 KCl: (a) CPE, (b) PCF-qnz/CPE, and (c) PBA-qnz/CPE. We inserted the Randles circuit model for the electrodes. Rs: solution resistance; Rct: charge-transfer resistance; Zw: Warburg impedance; Cdl: double-layer capacitance.
