Novel MnOOH–graphene nanocomposites: Preparation, characterization and electrochemical properties for supercapacitors

• Novel MnOOH–graphene nanocomposites were prepared by a one-step hydrothermal method.
• The assembly can form new electron transfer channels to accelerate electron transfer.
• The capacitive and rate performances are enhanced in both neutral and alkaline medium.

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.

The MnOOH–graphene nanocomposites shows better specific capacitance with the values achieved 112 F g−1 in 1 M Na2SO4 and 165 F g−1 in 6 M KOH electrolyte, respectively.Figure optionsDownload as PowerPoint slide