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(a) Cyclic voltammograms recorded at NH2-PD/SWCNT-GC electrode in the presence of 5 mM Ru(NH3)63+ in acetate buffer at pH 3.0 (—) and at pH 6.0 (red − −). (b) Cyclic voltammograms recorded at COOH-PD/SWCNT-GC electrode in the presence of 5 mM Fe(CN)63-/4- at pH 4 (—) and at pH 2 (red − −).
