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MnO2/graphene nanocomposites with different morphologies were synthesized and the petal-shaped nanosheet MnO2/graphene composite was developed as an electrode material for nonenzymatic hydrogen peroxide (H2O2) sensor. The morphology, structure, composition, and hydrophilicity of the resulting products were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and the contact angle tests. In addition, the fabricated MnO2/graphene composites could be used as catalysts for the electrochemical oxidation of H2O2. Cyclic voltammogram (CV) experiments indicated that MnO2/graphene-modified electrode showed good electrocatalytic activity towards both the oxidation and reduction of H2O2 in a neutral environment. Amperometric response results illustrated that this nonenzymatic sensor had excellent anti-interference ability and displayed two linear ranges from 10 to 90 µM and from 0.2 to 0.9 mM with a detection limit of 2 µM. [ABSTRACT FROM AUTHOR]