Non-enzymatic hydrogen peroxide sensor based on MnO2-ordered mesoporous carbon composite modified electrode

A novel non-enzymatic hydrogen peroxide (H2O2) sensor based on the MnO2-ordered mesoporous carbon (OMC) nanocomposite modified glassy carbon electrode (MnO2/OMC/GCE) was developed. OMC was synthesized and dropped onto the surface of glassy carbon electrode, and MnO2 nanoparticles were then electrodeposited on the surface of OMC to fabricate the MnO2/OMC/GCE. The electrochemical behaviors of H2O2 at the modified electrode were investigated by cyclic voltammetry and amperometry. The results showed that the MnO2/OMC/GCE exhibited excellent electrocatalytic activity toward H2O2. Optimization of measurement parameters such as the amount of MnO2, applied potential and pH value were studied in detail. Under the optimum conditions, the calibration curve for H2O2 determination was linear in the range from 5 x 10(-7) to 6 x 10(-4) M with a detection limit of 7.0 x 10(-8) M (S/N = 3), and the sensitivity of the sensor was calculated to be 806.8 mu A mM(-1) cm(-2). (C) 2012 Elsevier Ltd. All rights reserved.