Structural changes in reduced graphene oxide upon MnO2 deposition by the redox reaction between carbon and permanganate ions

Suk Woo Lee, Seong Min Bak, Chang Wook Lee, Cherno Jaye, Daniel A. Fischer, Bae Kyun Kim, Xiao Qing Yang, Kyung Wan Nam, Kwang Bum Kim

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46 Citations (Scopus)

Abstract

We explore structural changes of the carbon in MnO2/reduced graphene oxide (RGO) hybrid materials prepared by the direct redox reaction between carbon and permanganate ions (MnO4-) to reach better understanding for the effects of carbon corrosion on carbon loss and its bonding nature during the hybrid material synthesis. In particular, we carried out near-edge X-ray absorption fine structure spectroscopy at the C K-edge (284.2 eV) to show the changes in the electronic structure of RGO. Significantly, the redox reaction between carbon and MnO4- causes both quantitative carbon loss and electronic structural changes upon MnO2 deposition. Such disruptions of carbon bonding have a detrimental effect on the initial electrical properties of the RGO and thus lead to a significant decrease in electrical conductivity. Electrochemical measurements of the MnO2/reduced graphene oxide hybrid materials using a cavity microelectrode revealed unfavorable electrochemical properties that were mainly due to the poor electrical conductivity of the hybrid materials. The results of this study should serve as a useful guide to rationally approaching the syntheses of metal/RGO and metal oxide/RGO hybrid materials.

Original languageEnglish
Pages (from-to)2834-2843
Number of pages10
JournalJournal of Physical Chemistry C
Volume118
Issue number5
DOIs
Publication statusPublished - 2014 Feb 6

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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