High quality pristine graphene (PG) dispersions are prepared conveniently via an organic salts assisted exfoliation method in a green, non-toxic, cheap and low boiling point solvent: ethanol. The PG is characterized by transmission electron microscopy and atomic force microscopy. Furthermore, the PG is used as an electrode material for fabrication of nonenzymatic sensor of hydrogen peroxide (H2O2). This nonenzymatic sensor shows enhanced electrocatalytic activity towards H2O2 and displays two linear ranges from 2.0 to 37.0 mu M and 37.0 to 437.0 mu M with a detection limit of 0.19 mu M (S/N = 3), which is comparable to those electrochemical sensors based on metal oxide or noble metal/graphene composites. (C) 2017 Elsevier Inc. All rights reserved.