Three-dimensional branched single-crystal β-Co(OH)2 nanowire array and its application for supercapacitor with excellent electrochemical property

Dongbo Yu, Yali Wang, Lei Zhang, Ze-Xian Low, Xinyi Zhang, Fanglin Chen, Yi Feng, Huanting Wang

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

Abstract We have for the first time fabricated a unique three-dimensional branched single-crystal β-Co(OH)2 nanowire array supported on Ni foam. This structure is formed by the splitting crystal growth effect combined with the specific topological structure of β-Co(OH)2. A branched Co3O4@MnO2 core–shell nanowire array is prepared for use as supercapacitor electrode. At a current density of 10 mA cm−2, the branched Co3O4@MnO2 core–shell nanowire array exhibits 0.99 F cm−2 of areal capacitance, which is 69.3% of the capacitance (1.43 F cm−2) measured at 1 mA cm−2. In addition, the branched core–shell hybrid can still retain 93.6% of the initial capacitance after 5000 cycles. Such excellent electrochemical performance of the branched Co3O4@MnO2 core–shell nanowire array is attributed to the unique configuration and the strong synergistic effect from the porous Co3O4 nanowire core and the ultrathin MnO2 shell.
Original languageEnglish
Pages (from-to)153-162
Number of pages10
JournalNano Energy
Volume10
DOIs
Publication statusPublished - Nov 2014

Keywords

  • Branched nanowire
  • Core–shell hybrid
  • Crystal splitting
  • Supercapacitor

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