Flexible Nb2O5 nanowires/graphene film electrode for high-performance hybrid Li-ion supercapacitors

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

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Author(s)

  • Hao Song
  • Jijiang Fu
  • Kang Ding
  • Chao Huang
  • Kai Wu
  • Xuming Zhang
  • Biao Gao
  • Kaifu Huo

Detail(s)

Original languageEnglish
Pages (from-to)599-606
Journal / PublicationJournal of Power Sources
Volume328
Online published25 Aug 2016
Publication statusPublished - 1 Oct 2016

Abstract

The hybrid Li-ion electrochemical supercapacitor (Li-HSC) combining the battery-like anode with capacitive cathode is a promising energy storage device boasting large energy and power densities. Orthorhombic Nb2O5 is a good anode material in Li-HSCs because of its large pseudocapacitive Li-ion intercalation capacity. Herein, we report a high-performance, binder-free and flexible anode consisting of long Nb2O5 nanowires and graphene (L-Nb2O5 NWs/rGO). The paper-like L-Nb2O5 NWs/rGO film electrode has a large mass loading of Nb2O5 of 93.5 wt% as well as short solid-state ion diffusion length, and enhanced conductivity (5.1 S cm−1). The hybrid L-Nb2O5 NWs/rGO paper electrode shows a high reversible specific capacity of 160 mA h g−1 at a current density of 0.2 A g−1, superior rate capability with capacitance retention of 60% when the current density increases from 0.2 to 5 A g−1, as well as excellent cycle stability. The Li-HSC device based on the L-Nb2O5/rGO anode and the cathode of biomass-derived carbon nanosheets delivers an energy density of 106 Wh kg−1 at 580 W kg−1 and 32 Wh kg−1 at a large power density of 14 kW kg−1. Moreover, the Li-HSC device exhibits excellent cycling performance without obvious capacitance decay after 1000 cycles.

Research Area(s)

  • Carbon nanosheets, Electrochemical performance, Graphene, Hybrid Li-ion supercapacitors, Nb2O5 nanowires

Citation Format(s)

Flexible Nb2O5 nanowires/graphene film electrode for high-performance hybrid Li-ion supercapacitors. / Song, Hao; Fu, Jijiang; Ding, Kang; Huang, Chao; Wu, Kai; Zhang, Xuming; Gao, Biao; Huo, Kaifu; Peng, Xiang; Chu, Paul K.

In: Journal of Power Sources, Vol. 328, 01.10.2016, p. 599-606.

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