Preparation of cobalt-tetraphenylporphyrin/reduced graphene oxide nanocomposite and its application on hydrogen peroxide biosensor

A novel cobalt-tetraphenylporphyrin/reduced graphene oxide (CoTPP/RGO) nanocomposite was prepared by a pi-pi stacking interaction and characterized by ultraviolet-visible absorption spectroscopy (UV-vis), Fourier transform infrared spectroscopy (FTIR) and electrochemical impedance spectroscopy (EIS). The CoTPP/RGO nanocomposite exhibited high electrocatalytic activity both for oxidation and reduction of H2O2. The current response was linear to H2O2 concentration with the concentration range from 1.0 x 10(-7) to 2.4 x 10(-3) mol L-1 (R = 0.998) at the reductive potential of -0.20V and from 1.0 x 10(-7) to 4.6 x 10(-4) mol L-1 (R = 0.996) at the oxidative potential of +0.50V. The H2O2 biosensor showed good anti-interfering ability towards oxidative interferences at the oxidative potential of +0.50V and good anti-interfering ability towards reductive interferences at the reductive potential of -0.20V. (C) 2013 Elsevier B.V. All rights reserved.