▎ 摘　　要

Reduced graphene oxide sheets decorated with cobalt oxide nanoparticles (Co3O4/rGO) were produced using a hydrothermal method without surfactants. Both the reduction of GO and the formation of Co3O4 nanoparticles occurred simultaneously under this condition. At the same current density of 0.5 A g(-1), the Co3O4/rGO nanocomposites exhibited much a higher specific capacitance (545 F g(-1)) than that of bare Co3O4 (100 F g(-1)). On the other hand, for the detection of H2O2, the peak current of Co3O4/rGO was 4 times higher than that of Co3O4. Moreover, the resulting composite displayed a low detection limit of 0.62 mM and a high sensitivity of 28,500 mu A mM(-1)cm(-2) for the H2O2 sensor. These results suggest that the Co3O4/rGO nanocomposite is a promising material for both supercapacitor and non-enzymatic H2O2 sensor applications. (C) 2016 Elsevier Masson SAS. All rights reserved.