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Building 3D structures of vanadium pentoxide nanosheets and application as electrodes in supercapacitors

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  • Jixin Zhu
  • Liujun Cao
  • Yingsi Wu
  • Yongji Gong
  • Zheng Liu
  • Harry E. Hoster
  • Yunhuai Zhang
  • Shengtao Zhang
  • Shubin Yang
  • Qingyu Yan
  • Pulickel M. Ajayan
  • Robert Vajtai
<mark>Journal publication date</mark>11/2013
<mark>Journal</mark>Nano Letters
Issue number11
Number of pages6
Pages (from-to)5408-5413
Publication StatusPublished
<mark>Original language</mark>English


Various two-dimensional (2D) materials have recently attracted great attention owing to their unique properties and wide application potential in electronics, catalysis, energy storage, and conversion. However, large-scale production of ultrathin sheets and functional nanosheets remains a scientific and engineering challenge. Here we demonstrate an efficient approach for large-scale production of V2O5 nanosheets having a thickness of 4 nm and utilization as building blocks for constructing 3D architectures via a freeze-drying process. The resulting highly flexible V2O5 structures possess a surface area of 133 m(2) g(-1), ultrathin walls, and multilevel pores. Such unique features are favorable for providing easy access of the electrolyte to the structure when they are used as a supercapacitor electrode, and they also provide a large electroactive surface that advantageous in energy storage applications. As a consequence, a high specific capacitance of 451 F g(-1) is achieved in a neutral aqueous Na2SO4 electrolyte as the 3D architectures are utilized for energy storage. Remarkably, the capacitance retention after 4000 cycles is more than 90%, and the energy density is up to 107 W.h.kg(-1) at a high power density of 9.4 kW kg(-1).