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*

*この研究の対応する著者

研究成果査読

35 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)336-344
ページ数9
ジャーナルNano Energy
52
DOI
出版ステータスPublished - 2018 10

ASJC Scopus subject areas

  • 再生可能エネルギー、持続可能性、環境
  • 材料科学(全般)
  • 電子工学および電気工学

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