Synthesis and Electrochemical Properties of Functionalized Graphene Oxide/ZnO Composites

Abstract:

ZnO quantum dots (QDs) are anchored on graphene oxide (GO) by a wet chemical self-assembling technique. Firstly, GO are functionalized with thiol (f-GO) by a series of chemical reactions and the ZnO alcogel are prepared by a sol–gel process. Secondly, the f-GO/ZnO composite is obtained by a self-assembling technique. Typically, X-ray diffraction (XRD), scanning electron microscopy (SEM) and EDS spectrum are employed to characterize the structure, morphology and composition of the obtained samples, moreover, the electrochemical performance of the as-prepared electrode is also detected by cyclic voltammetry and galvanostatic charge–discharge experiments. It is found that the f-GO/ZnO-1 possesses the highest specific values of 149.4F/g and good long-term cycle stability. The results show that the f-GO/ZnO nanocomposite could be used as electrode material for high performance supercapacitors.

• Periodical: Key Engineering Materials (Volume 680)
• Pages: 233-237
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.680.233
• Online since: February 2016
• Authors: Fang Fang Ding, Na Zhang, Cheng Zhang
• Keywords: Electrochemical Performance, Graphene, Supercapacitors, ZNO

References

[1] S. Chen, J. Zhu, X. Wang, Graphene oxide−MnO2 nanocomposites for supercapacitors, ACS Nano 4 (2010) 2822-2830.

[2] K.S. Novoselov, V.I. Fal'ko, L. Colombo, P.R. Gellert, M.G. Schwab and K. Kim, A roadmap for graphene, Nature. 490 (2012) 192-200.

DOI: 10.1038/nature11458

[3] P. X. Gao, Z. L. Wang, High-yield synthesis of single-crystal nanosprings of ZnO, Small 1 (2005) 945–949.

DOI: 10.1002/smll.200500165

[4] Y. Ito, M. Nyce, R. Plivelich, M. Klein, D. Steingart, S. Banerjee, Zinc morphology in zinc-nickel flow assisted batteries and impact on performance, J. Power Sources 196 (2011) 2340-2345.

DOI: 10.1016/j.jpowsour.2010.09.065

[5] W.S. Hummers and R.E. Offeman, Preparation of graphitic oxide, J. Am. Chem. Soc. 80 (1958) 1339.

DOI: 10.1021/ja01539a017

[6] L. Spanhel, M.A. Anderson, Semiconductor clusters in the sol–gel process: quantized aggregation, gelation, and crystal growth in concentrated ZnO colloids. J Am Chem Soc 113 (1991) 2826–33.

DOI: 10.1021/ja00008a004