Role of graphene on hierarchical flower-like NiAl layered double hydroxide-nickel foam-graphene as binder-free electrode for high-rate hybrid supercapacitor

Luojiang Zhang, K. N. Hui, K. S. Hui, Xin Chen, Rui Chen, Haiwon Lee

Research output: Contribution to journalArticle

52 Scopus citations

Abstract

In this work, a facile two-step hydrothermal method was reported to grow hierarchical flower-like NiAl layered double hydroxide (LDH) directly on 3D nickel foam (NF) which was further coated with 2D graphene nanosheets (GNS) layers as binder-free supercapacitor electrode. The positive and negative effects of GNS on the electrochemical performance of LDH-NF electrode were investigated in detail. The prepared LDH-NF/GNS electrode maintained an enhanced specific capacity of 165.6 C g-1 after 4000 cycles at a high current density of 40 A g-1. Furthermore, a hybrid supercapacitor, with LDH-NF/GNS and GNS-NF as the positive and negative electrodes, achieved an energy density (31.5 Wh kg-1 at a power density of 400 W kg-1) and super long-term cycle stability (a specific capacity of 67.2 C g-1 at 5 A g-1 after 5000 cycles with 80% retention). This study not only opens up the possibility of engineering LDH-NF/GNS into a promising electrode, but also highlights the positive and negative roles of GNS on LDH-NF as binder-free electrodes for further development of high-performance supercapacitors.

Original languageEnglish
Pages (from-to)9443-9453
Number of pages11
JournalInternational Journal of Hydrogen Energy
Volume41
Issue number22
DOIs
StatePublished - 2016 Jun 15

Keywords

  • Energy density
  • Graphene
  • Hybrid supercapacitor
  • Layered double hydroxide
  • Nickel foam

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