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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.56  No.11 (2015)  >  pp.1857-1862

MATERIALS TRANSACTIONS
<<Previous article Vol.56  No.11 (2015)   pp.1857 - 1862 Next article>>

The Tuning of Phase, Morphology and Performance of Graphene Oxide/Manganese Oxide for Supercapacitors

Fangfang Ding1), Na Zhang1), Cheng Zhang1), Changwei Zhang1)
1) Shanghai Institute of Technology

The reduced graphene oxide (rGO)/manganese oxides (MnO2) composites are obtained from GO/MnO2 precursor by the microwave-assisted reducing procedures. Characterization indicates that the phase and morphology transformation have been discovered in GO/MnO2 composite for the first time, and this transition can be explained by a “dissolution-precipitation” model. The capacitive properties of the rGO/MnO2 electrodes are measured using cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) tests. The rGO/Mn3O4 in hydrazine hydrate (H-rGO/Mn3O4) exhibits a specific capacitance as high as 324.9 F/g, which is about four times as the GO/MnO2 precursor (81.25 F/g). It is deduced that the diversity of ionic state of Mn3O4, the large specific surface area, and the large reduction degree of GO are favorable to the enhancement of the electrochemical performance. The results show that the H-rGO/Mn3O4 nanocomposite from GO/MnO2 can be used as electrode material for high performance supercapacitors.


Keyword:
graphene, manganese dioxide, manganese tetraoxide, supercapacitors, electrical performance

Received: March 10, 2015
Accepted: August 10, 2015 , Published online: October 25, 2015

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