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(A) FTIR spectra of the 3D-CB/PLA (black line) and 3D-CB/PLA–PT (red line); (B) Nyquist diagram of impedance spectra at +0.22 V of the 3D-CB/PLA (black dots) and 3D-CB/PLA–PT (red dots) electrodes in the presence of 2 mM [Fe(CN)6]3–/4– in 0.1 M KCl solution.
