Additions and corrections
A one-pot microwave-assisted non-aqueous sol–gel approach to metal oxide/graphene nanocomposites for Li-ion batteries
Seunghwan Baek , Seung-Ho Yu , Seung-Keun Park , Andrea Pucci , Catherine Marichy , Dong-Chan Lee , Yung-Eun Sung , Yuanzhe Piao and Nicola Pinna
RSC Adv., 2011, 1, 1687–1690 (DOI: 10.1039/C1RA00797A). Amendment published 19th June 2012.
The authors would like to make the following correction to the ESI:
The graphene oxide (GO) preparation was stated to be carried out via a
modified Hummer’s method as described in reference 1. However, for all
the samples synthesized in this work the GO was synthesized by the
traditional Hummer’s method. In a next article, now under finalization, a
comparison between the structural, morphological and Li-ion battery
data, as a function of the GO preparation method, will be discussed. It
turned out that the exfoliation degree of the GO and the final Li-ion
specific capacities are enhanced by using the modified Hummer’s method
compared to the original one. Finally, all the results presented in this
article are correct and reliable when the correct preparation of GO is
taken into consideration. The authors apologize for this error.
Therefore, in the ESI, the paragraph beginning 'Graphene oxide (GO) was
produced...' should be replaced by the following: Graphene oxide (GO)
was synthesized from graphite powder (<20 μm) following the Hummer's
method.2 Specifically, 1 g of graphite was added to a solution of concentrated H2SO4 (46 mL) containing 1 g of NaNO3 and it was stirred together in an ice bath for 2 hours. 6 g of KMnO4
were slowly added and reacted for 2 hours. The mixture was vigorously
stirred for 24 hours at room temperature prior to the addition of 250 mL
of DI water. The solution was then heated to 98 °C and maintained at
this temperature for 1 hour. Then, 6 mL of H2O2
(30 wt. %) were slowly added and the solution was filtered and washed
with 1:10 HCl aqueous solution to remove metal ions followed by repeated
washings with water and the solid was separated by centrifugation.
Finally, the precipitate was dried at 60 °C overnight.
References:
1. N. I. Kovtyukhova, P. J. Ollivier, B. R. Martin, T. E. Mallouk, S. A. Chizhik, E. V. Buzaneva, A. D. Gorchinskiy, Chem. Mater., 1999, 11, 771-778.
2. W. S. Hummers, R. E. Offeman, J. Am. Chem. Soc., 1958, 80, 1339-1339.
The Royal Society of Chemistry apologises for these errors and any consequent inconvenience to authors and readers.
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