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Chemically derived graphene-metal oxide hybrids as electrodes for electrochemical energy storage: pre-graphenization or post-graphenization?

MPS-Authors
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Chen,  Chenmeng
Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences;
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Zhang,  Qiang
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Beijing Key Laboratory of Green Reaction Engineering and Technology, Department of Chemical Engineering;

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Zhang,  Wei
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Zhao,  Xiao-Chen
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Science;

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Huang,  Chun-Hsien
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Department of Biomedical Engineering and Environmental Sciences, National Tsing-Hua University;

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Citation

Chen, C., Zhang, Q., Huang, J.-Q., Zhang, W., Zhao, X.-C., Huang, C.-H., et al. (2012). Chemically derived graphene-metal oxide hybrids as electrodes for electrochemical energy storage: pre-graphenization or post-graphenization? Journal of Materials Chemistry, 22(28), 13947-13955. doi:10.1039/C2JM16042K.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0010-1BD2-1
Abstract
The introduction of a secondary phase is an efficient and effective way to improve the electrochemical performance of graphene towards energy storage applications. Two fundamental strategies including pre-graphenization and post-graphenization were widely employed for graphene-based hybrids. However, there is still an open question of which way is better. In this contribution, we investigated the differences in the structure and electrochemical properties of pre- and post-graphenized graphene–SnO2 hybrids. The pre-graphenization is realized by synthesis of thermally reduced graphene and subsequent impregnation of SnO2, while the post-graphenization is realized by introducing a Sn-containing phase onto GO sheets followed by chemical reduction. The pre-graphenization process provides a large amount of pores for ion diffusion, which is of benefit for loading of SnO2, fast ion diffusion for supercapacitors, and higher capacity for Li-ion batteries, but poor stability, while the post-graphenization process offers compact graphene and good interaction between the SnO2 and graphene, which provides stable structure for long term stability for supercapacitor and Li-ion battery use.