Two-dimensional mesoporous vanadium phosphate nanosheets through liquid crystal templating method toward supercapacitor application

Peng Mei, Yusuf Valentino Kaneti, Malay Pramanik, Toshiaki Takei, Ömer Dag, Yoshiyuki Sugahara, Yusuke Yamauchi

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

Mesoporous vanadium phosphate (VOPO4) nanosheets have been successfully synthesized through an easy and reproducible lyotropic liquid crystals (LLC) templating approach for the first time. Using the triblock copolymer (P123) as a surfactant, VOPO4 precursor with a well-developed 2D hexagonal mesostructure can be obtained. Following complete removal of the template by calcination, crystallized VOPO4 frameworks with less-ordered mesostructure are achieved. The as-prepared mesoporous VOPO4 nanosheets exhibit superior pseudocapacitive performance (767 F g‒1 at 0.5A g‒1) by virtue of the favorable mesostructure that gives rise to abundant easily accessible redox active sites as well as reinforced charge transfer and ion diffusion properties. The charge storage mechanism of the mesoporous VOPO4 nanosheets has been experimentally demonstrated to be based on the reversible two-step redox reactions between V(V) and V(III) in acidic medium. This advantageous LLC templating strategy is expected to open up a new route for designing various mesoporous metal phosphates with superior electrochemical performance for utilization in energy storage devices.

Original languageEnglish
Pages (from-to)336-344
Number of pages9
JournalNano Energy
Volume52
DOIs
Publication statusPublished - 2018 Oct

Keywords

  • Lyotropic liquid crystals
  • Mesoporous materials
  • Metal phosphates
  • Nanosheets
  • Supercapacitors
  • Templated synthesis

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

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