Asymmetric Supercapacitors Based on Graphene/MnO<sub>2</sub> Nanospheres and Graphene/MoO<sub>3</sub> Nanosheets with High Energy Density

DOI Web Site Web Site 被引用文献6件
  • Jian Chang
    IBS Center for Integrated Nanostructure Physics Institute for Basic Science (IBS) Daejon 305‐701 Republic of Korea
  • Meihua Jin
    IBS Center for Integrated Nanostructure Physics Institute for Basic Science (IBS) Daejon 305‐701 Republic of Korea
  • Fei Yao
    IBS Center for Integrated Nanostructure Physics Institute for Basic Science (IBS) Daejon 305‐701 Republic of Korea
  • Tae Hyung Kim
    IBS Center for Integrated Nanostructure Physics Institute for Basic Science (IBS) Daejon 305‐701 Republic of Korea
  • Viet Thong Le
    IBS Center for Integrated Nanostructure Physics Institute for Basic Science (IBS) Daejon 305‐701 Republic of Korea
  • Hongyan Yue
    IBS Center for Integrated Nanostructure Physics Institute for Basic Science (IBS) Daejon 305‐701 Republic of Korea
  • Fethullah Gunes
    IBS Center for Integrated Nanostructure Physics Institute for Basic Science (IBS) Daejon 305‐701 Republic of Korea
  • Bing Li
    IBS Center for Integrated Nanostructure Physics Institute for Basic Science (IBS) Daejon 305‐701 Republic of Korea
  • Arunabha Ghosh
    IBS Center for Integrated Nanostructure Physics Institute for Basic Science (IBS) Daejon 305‐701 Republic of Korea
  • Sishen Xie
    IBS Center for Integrated Nanostructure Physics Institute for Basic Science (IBS) Daejon 305‐701 Republic of Korea
  • Young Hee Lee
    IBS Center for Integrated Nanostructure Physics Institute for Basic Science (IBS) Daejon 305‐701 Republic of Korea

書誌事項

公開日
2013-08-30
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/adfm201301851
公開者
Wiley

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説明

<jats:p>Asymmetric supercapacitors with high energy density are fabricated using a self‐assembled reduced graphene oxide (RGO)/MnO<jats:sub>2</jats:sub> (GrMnO<jats:sub>2</jats:sub>) composite as a positive electrode and a RGO/MoO<jats:sub>3</jats:sub> (GrMoO<jats:sub>3</jats:sub>) composite as a negative electrode in safe aqueous Na<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub> electrolyte. The operation voltage is maximized by choosing two metal oxides with the largest work function difference. Because of the synergistic effects of highly conductive graphene and highly pseudocapacitive metal oxides, the hybrid nanostructure electrodes exhibit better charge transport and cycling stability. The operation voltage is expanded to 2.0 V in spite of the use of aqueous electrolyte, revealing a high energy density of 42.6 Wh kg<jats:sup>−1</jats:sup> at a power density of 276 W kg<jats:sup>−1</jats:sup> and a maximum specific capacitance of 307 F g<jats:sup>−1</jats:sup>, consequently giving rise to an excellent Ragone plot. In addition, the GrMnO<jats:sub>2</jats:sub>//GrMoO<jats:sub>3</jats:sub> supercapacitor exhibits improved capacitance with cycling up to 1000 cycles, which is explained by the development of micropore structures during the repetition of ion transfer. This strategy for the choice of metal oxides provides a promising route for next‐generation supercapacitors with high energy and high power densities.</jats:p>

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