Hydrogen peroxide sensor based on glassy carbon electrode modified with β-manganese dioxide nanorods

A novel sensor for hydrogen peroxide (H2O2) was fabricated using beta-MnO2 nanorods on a glassy carbon electrode (GCE). The nanorods were obtained by a hydrothermal method and characterized by scanning electron microscopy and X-ray diffraction. Cyclic voltammetry was used to evaluate the electrochemical performance of the modified GCE. The sensor exhibits excellent catalytic activity toward the oxidation of H2O2 and displays a rather wide linear range (from 2.5 mu M to 42.9 mM), high sensitivity (21.74 mu A center dot mM(-1)), a low detection limit (2.45 mu M at an S/N of 3), and a response time of < 5 s.