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(a) Schematics of Randle’s-like equivalent circuits for indicated electrode designs (b)Nyquist plots of the bare ITO electrode and modified ITO electrodes with different architectures of AuNPs and 4-thiolphenyl as indicated. The measurements were recorded in aqueous solution of [Fe(CN)6]3−/4− (1:1, 10−2 M) and KCl (0.1 M,) in the frequency range from 1 Hz to 100 kHz.
