Structural changes in reduced graphene oxide upon MnO 2 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

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

We explore structural changes of the carbon in MnO 2 /reduced graphene oxide (RGO) hybrid materials prepared by the direct redox reaction between carbon and permanganate ions (MnO 4 - ) 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 MnO 4 - causes both quantitative carbon loss and electronic structural changes upon MnO 2 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 MnO 2 /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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Graphite
Redox reactions
Oxides
Graphene
graphene
Hybrid materials
Carbon
Ions
oxides
carbon
ions
Metals
X ray absorption near edge structure spectroscopy
electrical resistivity
Microelectrodes
synthesis
permanganic acid
Electrochemical properties
Electronic structure
metal oxides

All Science Journal Classification (ASJC) codes

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

Cite this

Lee, Suk Woo ; Bak, Seong Min ; Lee, Chang Wook ; Jaye, Cherno ; Fischer, Daniel A. ; Kim, Bae Kyun ; Yang, Xiao Qing ; Nam, Kyung Wan ; Kim, Kwang Bum. / Structural changes in reduced graphene oxide upon MnO 2 deposition by the redox reaction between carbon and permanganate ions In: Journal of Physical Chemistry C. 2014 ; Vol. 118, No. 5. pp. 2834-2843.
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Structural changes in reduced graphene oxide upon MnO 2 deposition by the redox reaction between carbon and permanganate ions . / Lee, Suk Woo; Bak, Seong Min; Lee, Chang Wook; Jaye, Cherno; Fischer, Daniel A.; Kim, Bae Kyun; Yang, Xiao Qing; Nam, Kyung Wan; Kim, Kwang Bum.

In: Journal of Physical Chemistry C, Vol. 118, No. 5, 06.02.2014, p. 2834-2843.

Research output: Contribution to journalArticle

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AU - Bak, Seong Min

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AU - Jaye, Cherno

AU - Fischer, Daniel A.

AU - Kim, Bae Kyun

AU - Yang, Xiao Qing

AU - Nam, Kyung Wan

AU - Kim, Kwang Bum

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N2 - We explore structural changes of the carbon in MnO 2 /reduced graphene oxide (RGO) hybrid materials prepared by the direct redox reaction between carbon and permanganate ions (MnO 4 - ) 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 MnO 4 - causes both quantitative carbon loss and electronic structural changes upon MnO 2 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 MnO 2 /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.

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