A reagentless non-enzymatic hydrogen peroxide sensor presented using electrochemically reduced graphene oxide
Sankararao Mutyala1, Jayaraman Mathiyarasu1
1Academy of Scientific and Innovative Research (AcSIR), CSIR-Central Electrochemical Research Institute, Karaikudi 630 006, Tamilnadu, India; Electrodics and Electrocatalysis Division, CSIR-Central Electrochemical Research Institute, Karaikudi 630 006, Tamilnadu, India.
Abstract:
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 (0.3μA/μM) and faster response upon the addition of H2O2 at an applied potential of -0.25V vs. Ag/AgCl. The detection limit is assessed to be 0.7μM (S/N=3) and the time to reach a stable study state current is <3s for a linear range of H2O2 concentration (1-16μM). In addition, the modified electrode exhibited good reproducibility and long-term stability.
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