▎ 摘　　要

Nitrogen doped graphene/manganese dioxide (N-GR/MnO2) composites were fabricated by a facile and economic method involving one-step hydrothermal reaction at low temperature (90 degrees C) in aqueous solution. Characterization and systematic investigations of the samples by X-ray diffraction and X-ray photoelectron spectroscopy confirmed that MnO2 nanoparticles were assembled with a small mass fraction of GR flakes and the incorporation of nitrogen atoms into GR skeleton was accomplished synchronously. The so-obtained MnO2-loaded and nitrogen-doped novel composites exhibited a capacitance as high as 171.65 F g(-1) at a current density of 2 mA cm(-2). Moreover, they exhibited good rate performances with long cycling stability for energy storage. Thus, these high-performance materials could act as promising candidates for energy storage devices. (C) 2014 Elsevier B.V. All rights reserved.