Hydrothermal synthesis of cobalt oxide porous nanoribbons anchored with reduced graphene oxide for hydrogen peroxide detection

A new Co3O4-reduced graphene oxide (Co3O4-rGO) nanostructure was successfully prepared by hydrothermal-synthesized Co3O4 porous nanoribbons with an approximate length of 6-17 mu m, a width of 21-737 nm, and a thickness of 33-80 nm hybridizing with reduced graphene oxide. The electrochemical properties of the Co3O4-rGO-modified electrode were investigated by the cyclic voltammograms and amperometric current-time method. The modified electrode shows high electrochemical activity for the catalytic reduction and detection of H2O2 in alkaline medium. The nonenzymatic hydrogen peroxide sensor exhibits wide linear range of 1-18.5 mM (R = 0.99439), high adsorption amount about 3.24 x 10(-6) mol/cm(2), and a low detection limit of 5.35 x 10(-7) M (S/N = 3). In addition, the sensor has a fast response (<5 s), good long-term stability, excellent repeatability (3.22 % relative standard deviation), and high selectivity. These outstanding properties of the sensor derive from their particular hybrid structure and synergistic effects between rGO and Co3O4.