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Cyclic voltammetry curves recorded for (a) ITO electrode in 0.1 M phosphate buffer saline containing 2 mM of KP (10 cycles, scan rate of 50 mV·s−1) and (b) ITO and ITO/KP electrode in 0.5 M Na2SO4 containing 5 mM [Fe(CN)6]3−/4−, scan rate 100 mV·s−1.
