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(a) Cyclic voltammograms of (I) the bare 3D BC/c-MWCNTs electrode and BC/c-MWCNTs/Lac electrode in a 0.1 M acetic acid/sodium acetate buffer solution (pH 5.5) at scan rates (mV s−1): (II) 50, (III) 150, (IV) 250, (V) 350; and (b) The inset is a plot of the oxidation and reduction peak currents vs. the scan rates.
