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Graphene-assisted room-temperature synthesis of 2D nanostructured hybrid electrode materials: Dramatic acceleration of the formation rate of 2D metal oxide nanoplates induced by reduced graphene oxide nanosheets

Title
Graphene-assisted room-temperature synthesis of 2D nanostructured hybrid electrode materials: Dramatic acceleration of the formation rate of 2D metal oxide nanoplates induced by reduced graphene oxide nanosheets
Authors
Sung D.-Y.Gunjakar J.L.Kim T.W.Kim I.Y.Lee Y.R.Hwang S.-J.
Ewha Authors
황성주Gunjakar Jayavant Laxman
SCOPUS Author ID
황성주scopus; Gunjakar Jayavant Laxmanscopus
Issue Date
2013
Journal Title
Chemistry - A European Journal
ISSN
0947-6539JCR Link
Citation
vol. 19, no. 22, pp. 7109 - 7117
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
A new prompt room temperature synthetic route to 2D nanostructured metal oxide-graphene-hybrid electrode materials can be developed by the application of colloidal reduced graphene oxide (RGO) nanosheets as an efficient reaction accelerator for the synthesis of δ-MnO2 2D nanoplates. Whereas the synthesis of the 2D nanostructured δ-MnO2 at room temperature requires treating divalent manganese compounds with persulfate ions for at least 24h, the addition of RGO nanosheet causes a dramatic shortening of synthesis time to 1h, underscoring its effectiveness for the promotion of the formation of 2D nanostructured metal oxide. To the best of our knowledge, this is the first example of the accelerated synthesis of 2D nanostructured hybrid material induced by the RGO nanosheets. The observed acceleration of nanoplate formation upon the addition of RGO nanosheets is attributable to the enhancement of the oxidizing power of persulfate ions, the increase of the solubility of precursor MnCO3, and the promoted crystal growth of δ-MnO 2 2D nanoplates. The resulting hybridization between RGO nanosheets and δ-MnO2 nanoplates is quite powerful not only in increasing the surface area of manganese oxide nanoplate but also in enhancing its electrochemical activity. Of prime importance is that the present δ-MnO2-RGO nanocomposites show much superior electrode performance over most of 2D nanostructured manganate systems including a similar porous assembly of RGO and layered MnO2 nanosheets. This result underscores that the present RGO-assisted solution-based synthesis can provide a prompt and scalable method to produce nanostructured hybrid electrode materials. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
DOI
10.1002/chem.201300001
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자연과학대학 > 화학·나노과학전공 > Journal papers
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