Fabrication of Homogeneously Dispersed Nanoneedle Manganese Dioxide/Graphene Composite for High-Performance Electrode Use in Supercapacitor

Abstract:

Two types of graphene/MnO2 composites were synthesized by different reaction procedures. R-GO/MnO₂ was synthesized as follows: first, nanoneedle MnO₂ was formed on the GO sheets using various functional groups (GO/MnO₂). In the second stage, GO/MnO₂ was reduced to graphene/MnO₂ (R-GO/MnO₂) via the dipping method. rGO/MnO₂ was synthesized using a different reaction order: first, graphene oxide was reduced to graphene and nanoneedle MnO₂ was formed on graphene sheets. Characterization indicated that the nanoneedle MnO₂ structures in the R-GO/MnO₂ composite were homogeneously dispersed on graphene sheets, whereas MnO₂ in the rGO/MnO₂ composite formed aggregates due to absence of functional groups. The R-GO/MnO₂ electrode exhibited a specific capacitance as high as 327.5 Fg^-1at 10 mVs^-1, which was higher than that of the rGO/MnO₂ electrode (229.9 Fg^-1). It is anticipated that the formation of nanoneedle MnO₂ on the GO surface following the reduction procedure could be a promising fabrication method for supercapacitor electrodes.

• Periodical: Advanced Materials Research (Volume 894)
• Pages: 8-12
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.894.8
• Online since: February 2014
• Authors: Myeong Jin Kim, Ki Ho Kim, Myeong Yeol Yoo, Joo Heon Kim
• Keywords: Grapheme/MnO₂, Hydrazine Hydrate, Nanoneedle, Reduction, Super-Capacitor (SC)

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