▎ 摘　　要

In this paper, we report a simple and controlled synthesis of novel MnOOH-graphene nanocomposites with a one-step facile hydrothermal method. It is template-free and easy to reproduce. Electrochemical properties are investigated in different media. The values of specific capacitance achieved are 112 F g(-1) in 1 M Na2SO4 and 165 F g(-1) in 6 M KOH electrolyte, respectively. The assembly of multiple branched MnOOH and graphene flakes results in synergistic effects, forming new electron transfer channels to accelerate electron transfer and provide the pseudocapacitance to increase the overall capacitance. The novel composites have potential applications in the fields of supercapacitors, lithium battery and so on. (C) 2014 Elsevier Inc. All rights reserved.