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. 2017 Mar 3;7:43181. doi: 10.1038/srep43181

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Typical Nyquist plots obtained for the bare and modified electrodes (a–d) in [Fe(CN)₆]⁴⁻/[Fe(CN)₆]³⁻ redox probe at fixed potential 0.22 V (vs Ag/AgCl, sat’d KCl). (e) Represents the circuit used in the fitting of the EIS data in (a–d).