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Nanoflake-like cobalt hydroxide/ordered mesoporous carbon composite for electrochemical capacitors

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Abstract

Nanocomposites consisting of mesoporous carbon CMK-3 and cobalt hydroxide nanoflakes are synthesized by a chemical precipitation method. The successful growth of nanometer-sized Co(OH)2 flakes on the surface of CMK-3 is confirmed by scanning electron microscopy. The Co(OH)2/CMK-3 composite electrodes are investigated for its use in the electrochemical capacitors with cyclic voltammograms, chronopotentiometric measurements, and electrochemical impedance spectroscopy. Experimental studies reveal that the Co(OH)2/CMK-3 composite electrode with the 20 wt.% CMK-3 presents excellent electrochemical performance with specific capacitance of 750 F/g (or 910 F/g after being corrected for the weight percentage of the Co(OH)2 phase). The overall improved electrochemical behavior accounts for the unique structure design in the Co(OH)2/CMK-3 composite in terms of porous nanostructure, large specific surface area, and good electrical conductance. The Co(OH)2/CMK-3 composite electrode also shows better rate capability and cyclic stability, suggesting its potential applications as the electrode materials for electrochemical capacitors.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (no. 50602020) and the National Basic Research Program of China (no. 2007CB216408).

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Authors and Affiliations

  1. State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, Lanzhou, 730050, People’s Republic of China

    Jing Zhang, Ling-Bin Kong & Jian-Jun Cai

  2. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, People’s Republic of China

    Ling-Bin Kong, Yong-Chun Luo & Long Kang

Authors
  1. Jing Zhang
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  2. Ling-Bin Kong
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  3. Jian-Jun Cai
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  4. Yong-Chun Luo
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  5. Long Kang
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Corresponding author

Correspondence to Ling-Bin Kong.

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Zhang, J., Kong, LB., Cai, JJ. et al. Nanoflake-like cobalt hydroxide/ordered mesoporous carbon composite for electrochemical capacitors. J Solid State Electrochem 14, 2065–2075 (2010). https://doi.org/10.1007/s10008-010-1035-7

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  • DOI: https://doi.org/10.1007/s10008-010-1035-7

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