Jump to main content
Jump to site search

Issue 44, 2016
Previous Article Next Article

Free-standing NiV2S4 nanosheet arrays on a 3D Ni framework via an anion exchange reaction as a novel electrode for asymmetric supercapacitor applications

Author affiliations

Abstract

NiV2S4 nanosheet arrays are grown on Ni foam by an anion exchange reaction using Ni3(VO4)2 nanosheet arrays as a template. The height and thickness of Ni3(VO4)2 nanosheet arrays are ∼200 and ∼10 nm, respectively, and the thickness increases with increasing reaction time. The shape and size of NiV2S4 nanosheet arrays remain unchanged after the anion exchange reaction of Ni3(VO4)2 nanosheet arrays. The NiV2S4 nanosheet array exhibits better electrochemical performance than the Ni3(VO4)2 nanosheet arrays. The NiV2S4 nanosheet array based electrode exhibited a specific capacity of 639 C g−1 at 2 mA cm−2 with enhanced rate capability and an excellent capacity retention of 90.7% at 30 mA cm−2 current density after 2000 cycles. The better electrochemical performance of the sulfide based electrode as compared to the oxide one is related to low electronegativity and large size of sulfur, which creates a robust structure and better transport properties. An asymmetric supercapacitor is fabricated, using NiV2S4 nanosheet arrays as the cathode and activated carbon (AC) as the anode, which shows high specific capacity (206 C g−1), energy density (45.1 W h kg−1) and power density (240 W kg−1) at 0.3 A g−1. 90.7% specific capacity retention after 1000 consecutive charge–discharge cycles makes it a promising candidate for future high energy storage systems.

Graphical abstract: Free-standing NiV2S4 nanosheet arrays on a 3D Ni framework via an anion exchange reaction as a novel electrode for asymmetric supercapacitor applications

Back to tab navigation

Supplementary files

Publication details

The article was received on 20 Aug 2016, accepted on 12 Oct 2016 and first published on 12 Oct 2016


Article type: Paper
DOI: 10.1039/C6TA07171F
Citation: J. Mater. Chem. A, 2016,4, 17512-17520
  •   Request permissions

    Free-standing NiV2S4 nanosheet arrays on a 3D Ni framework via an anion exchange reaction as a novel electrode for asymmetric supercapacitor applications

    R. Kumar, P. Rai and A. Sharma, J. Mater. Chem. A, 2016, 4, 17512
    DOI: 10.1039/C6TA07171F

Search articles by author

Spotlight

Advertisements