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

Authors
  • Zhu, Jixin
  • Cao, Liujun
  • Wu, Yingsi
  • Gong, Yongji
  • Liu, Zheng
  • Hoster, Harry E
  • Zhang, Yunhuai
  • Zhang, Shengtao
  • Yang, Shubin
  • Yan, Qingyu
  • Ajayan, Pulickel M
  • Vajtai, Robert
Type
Published Article
Journal
Nano Letters
Publisher
American Chemical Society
Publication Date
Jan 01, 2013
Volume
13
Issue
11
Pages
5408–5413
Identifiers
DOI: 10.1021/nl402969r
PMID: 24148090
Source
Medline
License
Unknown

Abstract

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).

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