Construction of sulfur vacancies enriched hollow zinc cobalt bimetallic sulfides for high-performance supercapacitors

Xingyue Qian, Yixuan Yin, Yuchen Lu, Jiawei Xia, Bingji Huang, Jingwen Sun, Guangyu He, Haiqun Chen

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Designing bimetallic sulfide materials with well-defined nanostructure and high energy density is indeed desirable for high-performance supercapacitors. Here, a hollow zinc cobalt sulfide (ZnxCo3−xS4) dodecahedron with plentiful sulfur vacancies is synthesized through a co-precipitation approach followed by a solvothermal vulcanization treatment. The tailored hollow structure can effectively accelerate the charge transport and facilitate the diffusion of OH-, whereas the sulfur vacancies significantly increase the amount of contact active sites and enhance the electronic conductivity. Both of the features can simultaneously promote the capacitance performance of ZnxCo3−xS4 for supercapacitors, where the most-performing Zn0.3Co2.7S4 electrode, achieves a high specific capacitance of 545.9 C g−1 in 3 M KOH electrolyte at the current density of 1 A g−1 and excellent long-term durability of 84.7% capacity retention after 1000 cycles. Particularly, the assembled aqueous hybrid supercapacitors delivers high energy density and superior cyclic stability. This study demonstrates a rational design of well-controlled bimetallic sulfides with outstanding electrochemical performance for energy storage devices.

Original languageEnglish
Article number165191
JournalJournal of Alloys and Compounds
Volume913
DOIs
StatePublished - 25 Aug 2022
Externally publishedYes

Keywords

  • Hollow nanostructure
  • Hybrid supercapacitors
  • Metal-organic frameworks
  • Sulfur vacancy
  • Zinc cobalt sulfides

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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