Effect of fluorine doping and sulfur vacancies of CuCo2S4 on its electrochemical performance in supercapacitors

Ling Kang, Chun Huang, Jian Zhang, Mengyao Zhang, Nan Zhang, Shude Liu, Yan Ye, Chen Luo, Zhiwei Gong, Chaolun Wang, Xiaofeng Zhou, Xing Wu, Seong Chan Jun

Research output: Contribution to journalArticlepeer-review

92 Citations (Scopus)


The intriguing features of copper cobalt sulfide (CuCo2S4), such as multiple Faradaic reactions and abundant valance states, enable it a promising electrode material for supercapacitors. However, the sluggish transfer kinetics of charges and the insufficient number of active sites hamper its practical application. Herein, an efficient strategy was proposed to boost the electrochemical performance of CuCo2S4 through a synergetic incorporation of F dopants and S vacancies. The induced effects of F dopant and S vacancy of CuCo2S4 (denoted as F-CuCo2S4−x) on the physical characteristics and the electrochemical behaviors were investigated systemically. Experimental results reveal that through introduction of F dopants and S vacancies in dominant lattice, the low oxidation state concentrations of Cu and Co species are boosted remarkably, which lead to the improved electric conductivity and the enhanced interfacial activities of F-CuCo2S4−x, and facilitate the reaction kinetics. The as-synthesized F-CuCo2S4−x exhibits the ultrahigh specific capacity of 2202.7 C g−1 at 1 A g−1, and the excellent capacity retention of 96.7% after 5000 cycles at 20 A g−1. An asymmetric supercapacitor assembled with F-CuCo2S4−x and activated carbon as the positive and the negative electrodes, respectively, delivers the favorable energy density of 49.8 W h kg−1 at 897.39 W kg−1, as well as the long-term cycling lifetime. This study offers an effective strategy to optimize the transition metal compounds for electrochemical energy-storage devices.

Original languageEnglish
Article number124643
JournalChemical Engineering Journal
Publication statusPublished - 2020 Jun 15

Bibliographical note

Funding Information:
This work was supported by National Natural Science Fund of China (Grant No. 51975215 and 61574060 ) and the Science and Technology Commission of Shanghai Municipality , Project No. 19511120100 .

Publisher Copyright:
© 2020 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering


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