Jump to main content
Jump to site search

Issue 29, 2019
Previous Article Next Article

Hierarchical “tube-on-fiber” carbon/mixed-metal selenide nanostructures for high-performance hybrid supercapacitors

Author affiliations

Abstract

This work reports hierarchical “tube-on-fiber” nanostructures, composed of carbon nanotubes (CNTs) on carbon nanofibers (CNFs), impregnated with mixed-metal selenide nanoparticles (Co–Zn–Se@CNTs–CNFs), as high performance supercapacitors. Co–Zn hybrid zeolitic imidazolate framework-67 (Co–Zn ZIF-67) was electrospun with polyacrylonitrile (PAN) to form nanofibers that were sequentially thermally treated and subjected to selenylation. The “tube-on-fiber” structure is designed to confine the Co–Zn mixed-metal selenide nanoparticles and prevents their agglomeration. Extruded CNTs rooting in carbon nanofibers further improve the electronic conductivity. The mixed-metal selenide allows more accommodation space and faradic reactions compared to single metal selenide. Based on these merits, the hierarchical Co–Zn–Se@CNTs–CNFs exhibit a high specific capacity of 1040.1 C g−1 (1891 F g−1) at 1 A g−1 with impressive rate performance in supercapacitors. Furthermore, a hybrid supercapacitor with Co–Zn–Se@CNTs–CNFs as the cathode and porous carbon nanofibers as the anode (denoted as Co–Zn–Se@CNTs–CNFs//PCNFs) is fabricated. It delivers a superior energy and power density of 61.4 W h kg−1 and 754.4 W kg−1, respectively, and meanwhile retains 31.7 W h kg−1 of the energy density with 15 421.6 W kg−1 of the working power. In addition, the assembled supercapacitor device displays an excellent capacity retention of 88.6% after 8000 cycles at 5 A g−1.

Graphical abstract: Hierarchical “tube-on-fiber” carbon/mixed-metal selenide nanostructures for high-performance hybrid supercapacitors

Back to tab navigation

Supplementary files

Publication details

The article was received on 10 Apr 2019, accepted on 01 Jul 2019 and first published on 01 Jul 2019


Article type: Paper
DOI: 10.1039/C9NR03088C
Nanoscale, 2019,11, 13996-14009

  •   Request permissions

    Hierarchical “tube-on-fiber” carbon/mixed-metal selenide nanostructures for high-performance hybrid supercapacitors

    L. Lv, C. Zhi, Y. Gao, X. Yin, Y. Hu, D. Crespy and Y. Wang, Nanoscale, 2019, 11, 13996
    DOI: 10.1039/C9NR03088C

Search articles by author

Spotlight

Advertisements