Fabrication of dual-hollow heterostructure of Ni2CoS4 sphere and nanotubes as advanced electrode for high-performance flexible all-solid-state supercapacitors

Lu Liu, Anru Liu, Yuhan Xu, Fangqi Yang, Jun Wang, Qiang Deng, Zheling Zeng, Shuguang Deng

Research output: Contribution to journalArticle

Abstract

High-energy-density and flexible supercapacitors have shown numerous application potential in modern portable electronics. However, the relatively low specific capacity, poor rate retentions, and limited durability have hindered their implement. Herein, a novel hierarchical dual-hollow electrode, composed of a hollow Ni2CoS4 sphere and outer hollow Ni2CoS4 nanotubes (Ni2CoS4HS-HTs), is elaborately constructed. The Ni2CoS4HS-HT-5 exhibits a high specific capacity of 817.5 C g−1 at a current density of 1 A g−1 with remarkable rate retention of 75.3% at 50 A g−1. In an all-solid-state asymmetric supercapacitor of Ni2CoS4HS-HT-5//CAC, a high capacitance of 1511.5 mF cm−2 at 5 mA cm−2 is obtained with an exceptional energy density of 13.6 mWh cm−3 at a power density of 92.6 mW cm−3. In addition, the capacity retention reaches 96% over 2000 cycles at 20 mA cm−3, implying the outstanding durability. The flexibility and mechanical stability are demonstrated by the intact electrochemical performances under different bending angles. As a proof-of-concept, two Ni2CoS4HS-HT-5//CACs in series could successfully illuminate 31 LED indicators for more than 8 mins. These fascinating electrochemical performances benefit from the novel electrode structure and depict great potential for modern energy storage applications.

Original languageEnglish (US)
Pages (from-to)313-321
Number of pages9
JournalJournal of Colloid And Interface Science
Volume564
DOIs
StatePublished - Mar 22 2020

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Keywords

  • All-solid-state supercapacitor
  • Bimetal sulfide
  • Dual-hollow heterostructure
  • Flexible electrode

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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