Nickel-cobalt layered double hydroxide anchored zinc oxide nanowires grown on carbon fiber cloth for high-performance flexible pseudocapacitive energy storage devices

Imran Shakir, Muhammad Shahid, Usman Ali Rana, Inas M.Al Nashef, Rafaqat Hussain

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

Nickel-cobalt layered double hydroxide (Ni-Co LDH) nanoflakes-ZnO nanowires hybrid array has been directly synthesized on a carbon cloth substrate by a facile cost-effective two-step hydrothermal route. As electrode materials for flexible pseudocapacitors, Ni-Co LDH nanoflakes-ZnO nanowires hybrid array exhibits a significantly enhanced specific capacitance of 1927 Fg-1, which is a ∼1.8 time greater than pristine Ni-Co LDH nanoflakes. The synthesized Ni-Co LDH nanoflakes-ZnO nanowires hybrid array shows a maximum energy density of 45.55 Whkg-1 at a power density of 46.15 kWkg -1, which is 35% higher than the pristine Ni-Co LDH nanoflakes electrode. Moreover, Ni-Co LDH nanoflakes-ZnO nanowires hybrid array exhibit excellent excellent rate capability (80.3% capacity retention at 30 Ag -1) and cycling stability (only 3.98% loss after 3000 cycles), due to the significantly improved faradaic redox reaction.

Original languageBritish English
Pages (from-to)28-32
Number of pages5
JournalElectrochimica Acta
Volume129
DOIs
StatePublished - 20 May 2014

Keywords

  • Flexible supercapacitor
  • Nanoflakes
  • Nickel-cobalt layered double hydroxide
  • Zinc oxide nanowires

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