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Issue 29, 2019
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Hierarchical “tube-on-fiber” carbon/mixed-metal selenide nanostructures for high-performance hybrid supercapacitors

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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

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Supplementary files

Article information


Submitted
10 Apr 2019
Accepted
01 Jul 2019
First published
01 Jul 2019

Nanoscale, 2019,11, 13996-14009
Article type
Paper

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

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