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Cyclic voltammograms recorded in (A) [Ru(NH3)6]3+/2+ and (B) [Fe(CN)6]3–/4– (both 1 mM in 0.5 M KNO3) on an inkjet-printed BDD sensing chip at different scan rates. Insets show the linear dependence of the peak current densities on the square root of the scan rate.
