Vanadium Pentoxide Nanorods Anchored to and Wrapped with Graphene Nanosheets for High-Power Asymmetric Supercapacitors

Ge Li, Xiaolei Wang, Fathy M. Hassan, Matthew Li, Rasim Batmaz, Xingcheng Xiao, Aiping Yu

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

Asymmetric lithium-ion supercapacitors have been obtaining great attention, owing to their significantly increased energy density. However, transition-metal-oxide-based electrode materials with poor conductivity and sluggish electrode kinetics often sacrifice power performance and cycling stability. Herein, we report the insitu growth of V2O5 nanorods on highly conductive graphene sheets as anode materials with high specific capacitance and excellent rate capability, which is mainly attributed to the intimate contact between the nanorods and graphene sheets. The asymmetric supercapacitor based on graphene/V2O5 composites and activated carbon is fabricated and evaluated, where a high energy density of approximately 50Whkg-1 can be achieved at a power density of 136.4Wkg-1, as well as long cycling stability. This work provides an effective and efficient method for the fabrication of high-performance asymmetric supercapacitors.

Original languageEnglish
Pages (from-to)1264-1269
Number of pages6
JournalChemElectroChem
Volume2
Issue number9
DOIs
Publication statusPublished - Sep 1 2015
Externally publishedYes

Keywords

  • Anode materials
  • Asymmetric supercapacitors
  • Graphene
  • Insitu growth
  • Vanadium oxide

ASJC Scopus subject areas

  • Catalysis
  • Electrochemistry

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