# Facial synthesis of MnO2/three dimensional graphene composite and its application in supercapacitors

Facial synthesis of MnO2/three dimensional graphene composite and its application in supercapacitors MnO2 nanoparticle/three dimensional graphene composite (MnO2/3DG) was synthesized by a hydrothermal template-free method and subsequent ultrasonic treatment in KMnO4 solution. The MnCO3/3DG particles can be detected after the hydrothermal process, which may be produced through the reaction between Mn2+ and $${\text{C}}{{\text{O}}_{\text{3}}}^{{\text{2}} - }$$ C O 3 2 - due to the decarboxylation of GO under the hydrothermal condition. The final product MnO2/3DG displayed high specific capacitance (324 F g− 1 at 0.4 A g−1) and good cycle stability (91.1% capacitance retention after 5000 cycles). Furthermore, the asymmetric supercapacitor assembled with MnO2/3DG and activated carbon (AC) exhibits an energy density of 33.78 Wh kg−1 at the powder density of 380 W kg−1. The excellent supercapacitance of the MnO2/3DG composite may be due to the high pseudocapacitance of the dispersed MnO2 nanoparticles and the conductive graphene with three dimensional porous microstructure. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Materials Science: Materials in Electronics Springer Journals

# Facial synthesis of MnO2/three dimensional graphene composite and its application in supercapacitors

, Volume 28 (17) – May 10, 2017
9 pages

/lp/springer_journal/facial-synthesis-of-mno2-three-dimensional-graphene-composite-and-its-cuJ5CUTwbp
Publisher
Springer US
Subject
Materials Science; Optical and Electronic Materials; Characterization and Evaluation of Materials
ISSN
0957-4522
eISSN
1573-482X
D.O.I.
10.1007/s10854-017-7074-4
Publisher site
See Article on Publisher Site

### Abstract

MnO2 nanoparticle/three dimensional graphene composite (MnO2/3DG) was synthesized by a hydrothermal template-free method and subsequent ultrasonic treatment in KMnO4 solution. The MnCO3/3DG particles can be detected after the hydrothermal process, which may be produced through the reaction between Mn2+ and $${\text{C}}{{\text{O}}_{\text{3}}}^{{\text{2}} - }$$ C O 3 2 - due to the decarboxylation of GO under the hydrothermal condition. The final product MnO2/3DG displayed high specific capacitance (324 F g− 1 at 0.4 A g−1) and good cycle stability (91.1% capacitance retention after 5000 cycles). Furthermore, the asymmetric supercapacitor assembled with MnO2/3DG and activated carbon (AC) exhibits an energy density of 33.78 Wh kg−1 at the powder density of 380 W kg−1. The excellent supercapacitance of the MnO2/3DG composite may be due to the high pseudocapacitance of the dispersed MnO2 nanoparticles and the conductive graphene with three dimensional porous microstructure.

### Journal

Journal of Materials Science: Materials in ElectronicsSpringer Journals

Published: May 10, 2017

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