A novel nonenzymatic hydrogen peroxide sensor based on MnO2/graphene oxide nanocomposite

A new electrocatalyst, MnO2/graphene oxide hybrid nanostructure was successfully synthesized for the nonenzymatic detection of H2O2. The morphological characterization was examined by scanning electron microscopy and transmission electron microscopy. The MnO2/graphene oxide based electrodes showed high electrochemical activity for the detection of H2O2 in alkaline medium. The nonenzymatic biosensors displayed good performance along with low working potential, high sensitivity, low detection limit, and long-term stability, which could be attributed to the high surface area of graphene oxide providing for the deposition of MnO2 nanoparticles. These results demonstrate that this new nanocomposite with the high surface area and electrocatalytic activity offers great promise for new class of nanostructured electrode for nonenzymatic biosensor and energy conversion applications.