A reagentless non-enzymatic hydrogen peroxide sensor presented using electrochemically reduced graphene oxide modified glassy carbon electrode

Herein, We report a simple, facile and reproducible non-enzymatic hydrogen peroxide (H2O2) sensor using electrochemically reduced graphene oxide (ERGO) modified glassy carbon electrode (GCE). The modified electrode was characterized by Fourier transform infrared (FT-IR), UV-Visible, scanning electron microscopy (SEM) and atomic force microscopy (AFM) techniques. Cyclic voltammetric (CV) analysis revealed that ERGO/GCE exhibited virtuous charge transfer properties for a standard redox systems and showed excellent performance towards electroreduction of H2O2. Amperometric study using ERGO/GCE showed high sensitivity (0.3 mu A/mu M) and faster response upon the addition of H2O2 at an applied potential of -0.25 V vs. Ag/AgCl. The detection limit is assessed to be 0.7 mu M (S/N = 3) and the time to reach a stable study state current is <3 s for a linear range of H2O2 concentration (1-16 mu M). In addition, the modified electrode exhibited good reproducibility and long-term stability. (C) 2016 Elsevier B.V. All rights reserved.