Unusual formation of α-Fe2O3 hexagonal nanoplatelets in N-doped sandwiched graphene chamber for high-performance lithium-ions batteries

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Xi Wang
  • Wei Tian
  • Dequan Liu
  • Yoshio Bando
  • Dmitri Golberg

Detail(s)

Original languageEnglish
Pages (from-to)257-267
Journal / PublicationNano Energy
Volume2
Issue number2
Publication statusPublished - Mar 2013
Externally publishedYes

Abstract

Nowadays, 2D nanosheets or nanoplatelets have attracted great attention due to their wide applications. However, the synthesis of 2D α-Fe2O3 nanosheets with well-defined hexagonal shape is extremely challenging, because the selective growth along one specific facet is very hard to be realized. In our work, we studied the non-capping ligand mediated reaction within graphene layer chamber, and successfully synthesized α-Fe2O3 hexagonal nanoplatelets sandwiched between graphene layers (HP-Fe-G). These materials exhibit an improved electrochemical performance compared with the pre-existing α-Fe2O3 nanoparticles loaded graphene (G-Fe2O3) composites because of the uniqueness of such architectures: thin nanoplatelets, large enough sandwiched spaces to buffer the volume expansion and N-doped graphene. HP-Fe-G delivered an ultrahigh reversible capacity of 1100mAh/g after 50 cycles, thus higher than their theoretical value (926mAh/g); while G-Fe2O3 composites showed relatively low capacity retention even after only 20 cycles (582mAh/g). In addition, HP-Fe-G also reveal superior rate capability, 887mAh/g at 1C; in comparison, this value was only 135mAh/g at 1C for G-Fe2O3. © 2012 Elsevier Ltd.

Research Area(s)

  • α-Fe2O3, Graphene, Lithium-ions batteries, N-doped, Nanoplatelets, Sandwich

Citation Format(s)

Unusual formation of α-Fe2O3 hexagonal nanoplatelets in N-doped sandwiched graphene chamber for high-performance lithium-ions batteries. / Wang, Xi; Tian, Wei; Liu, Dequan; Zhi, Chunyi; Bando, Yoshio; Golberg, Dmitri.

In: Nano Energy, Vol. 2, No. 2, 03.2013, p. 257-267.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review