Structural Changes in Reduced Graphene Oxide upon MnO2 Deposition by the Redox Reaction between Carbon and Permanganate Ions

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• 作者：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
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：February 6, 2014
• 年：2014
• 卷：118
• 期：5
• 页码：2834-2843
• 全文大小：566K
• ISSN：1932-7455

文摘

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^{鈥?/sup>) 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鈥?/sup> 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.}