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 (0.3μA/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.
Academy 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.
Sankararao
S
Mutyala
Academy 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. Electronic address: al_mathi@yahoo.com.
Jayaraman
J
Mathiyarasu
D002244:Carbon / Q000737:chemistry; D055664:Electrochemical Techniques / Q000295:instrumentation; D004566:Electrodes; D006108:Graphite / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000032:analysis*; D057230:Limit of Detection; D018625:Microscopy, Atomic Force; D008855:Microscopy, Electron, Scanning; D010087:Oxides / Q000737:chemistry; D015203:Reproducibility of Results; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties
D010087:Oxides; D002244:Carbon; D006108:Graphite; D006861:Hydrogen Peroxide
Electrocatalytic reduction; Electrochemical biosensors; Electrochemically reduced graphene oxide; Hydrogen peroxide; Non-enzymatic