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Bifunctional Reduced Graphene Oxide/V2O5 Composite Hydrogel: Fabrication, High Performance as Electromagnetic Wave Absorbent and Supercapacitor

Authors

  • Dr. Hui Zhang,

    1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 (P.R. China), Fax: (+86) 0551-63861475
    2. School of Physics and Materials Science, Anhui University, Hefei 230601 (P.R. China)
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  • Prof. Anjian Xie,

    1. School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601 (P.R. China), Fax: (+86) 0551-63861475
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  • Dr. Cuiping Wang,

    1. School of Physics and Materials Science, Anhui University, Hefei 230601 (P.R. China)
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  • Dr. Haisheng Wang,

    1. School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601 (P.R. China), Fax: (+86) 0551-63861475
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  • Prof. Yuhua Shen,

    Corresponding author
    1. School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601 (P.R. China), Fax: (+86) 0551-63861475
    • Yuhua Shen, School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601 (P.R. China), Fax: (+86) 0551-63861475

      Xingyou Tian, Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 (P.R. China), Fax: (+86) 0551-63861475

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  • Prof. Xingyou Tian

    Corresponding author
    1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 (P.R. China), Fax: (+86) 0551-63861475
    • Yuhua Shen, School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601 (P.R. China), Fax: (+86) 0551-63861475

      Xingyou Tian, Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 (P.R. China), Fax: (+86) 0551-63861475

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Abstract

Multifunctional graphene hydrogels have attracted great attention aimed at practical applications. Herein, the novel and bifunctional composite hydrogel containing reduced graphene-oxide nanosheets (RGO) and V2O5 nanobelts (RGO/V2O5) is successfully prepared for the first time. Surprisingly, tridimensional (3D) RGO/V2O5 composite hydrogels cannot only be used as high-performance electromagnetic (EM) wave absorbents; they also exhibit excellent properties suitable for supercapacitor electrodes. The composites exhibit a maximum absorption of up to −21.5 dB. In particular, a composite hydrogel showed a bandwidth of 6.63 GHz, corresponding to a reflection loss at −10 dB, which opens the possibility for the use of 3D graphene with other functional nanomaterials as lightweight and high-performance EM wave absorption materials. Remarkably, the composite hydrogel is capable of delivering a high specific capacitance of about 320 F g−1 at a current density of 1.0 A g−1.

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