Construction of Single-Phase Nickel Disulfide Microflowers as High-Performance Electrodes for Hybrid Supercapacitors

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

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Author(s)

  • Ziyang Dai
  • Lichun Xue
  • Zhenbao Zhang
  • Yang Gao
  • Qingsheng Gao
  • Dengjie Chen

Detail(s)

Original languageEnglish
Pages (from-to)10178-10187
Journal / PublicationEnergy and Fuels
Volume34
Issue number8
Online published3 Jul 2020
Publication statusPublished - 20 Aug 2020
Externally publishedYes

Abstract

Developing supercapacitors with simultaneous superior power and energy density for energy-storage devices remains a challenge. In this work, single-phase NiS2 microflowers were synthesized through a hydrothermal process coupled with subsequent sulfidation. The obtained NiS2 microflowers perfectly inherited the flowerlike structure of the precursor, which was composed of nanosheets with firmly integrated nanoparticles. With the benefit of the single-phase crystal structure, suppressed surface oxidation, relatively high apparent conductivity, and unique nano/microstructure, the NiS2 microflowers presented outstanding electrochemical performance in the LiOH electrolyte. Specifically, the NiS2 microflowers exhibited high specific capacities of 813 C g-1 at 1 A g-1 and 580 C g-1 at 20 A g-1 and retained 93% of its initial capacity after 10,000-time cycling test. Moreover, an optimized NiS2//activated carbon (AC) hybrid supercapacitor fabricated with NiS2 microflowers as the positive electrode and AC as the negative electrode operated stably at a large voltage window of 1.8 V. It further delivered a considerable energy density of 39.8 W h kg-1 at 900 W kg-1. Impressively, the intriguing nano/microstructure further endowed the almost unabated capacitance after continuous cycling of 10,000 times. This study will definitely promote the design and preparation of high-performance nickel-based sulfides for hybrid supercapacitors.

Citation Format(s)

Construction of Single-Phase Nickel Disulfide Microflowers as High-Performance Electrodes for Hybrid Supercapacitors. / Dai, Ziyang; Xue, Lichun; Zhang, Zhenbao et al.
In: Energy and Fuels, Vol. 34, No. 8, 20.08.2020, p. 10178-10187.

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