Carbon Black-Modified Screen-Printed Electrodes as Electroanalytical Tools

In this paper screen-printed electrodes (SPEs) bulk modified with carbon black (CB) or with CB dispersion in DMF:water were developed and characterized. We have demonstrated by cyclic voltammetry, SEM and electrochemical impedance spectroscopy that an increase of CB amount on the working electrode surface increases the electrochemical performances of CB-SPE. The CB-SPE was tested with ferricyanide, epinephrine, benzoquinone and H2O2 demonstrating in any case an enhancement of electrochemical activity. For H2O2 amperometric detection, a sensitivity of 241.4 +/- 5.7 mA?M-1?cm-2 and 1.46 +/- 0.06 mA M-1?cm-2 was obtained, respectively, for CB-SPE and bare SPE.