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

This work reports hierarchical tube-on-fiber nanostructures, composed of carbon nanotubes (CNTs) on carbon nanofibers (CNFs), impregnated with mixed-metal selenide nanoparticles (CoZnSe@CNTsCNFs), as high performance supercapacitors. CoZn hybrid zeolitic imidazolate framework-67 (CoZn ZIF-67) was el...

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Bibliographic Details
Published inNanoscale Vol. 11; no. 29; pp. 13996 - 149
Main Authors Lv, Li-Ping, Zhi, Chuanwei, Gao, Yun, Yin, Xiaojie, Hu, Yiyang, Crespy, Daniel, Wang, Yong
Format Journal Article
LanguageEnglish
Published England Royal Society of Chemistry 07.08.2019
Subjects
Carbon fibers
Carbon nanotubes
Cobalt
Metal-organic frameworks
Nanofibers
Nanoparticles
Nanostructure
Polyacrylonitrile
Selenium
Supercapacitors
Zeolites
Zinc
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Summary:This work reports hierarchical tube-on-fiber nanostructures, composed of carbon nanotubes (CNTs) on carbon nanofibers (CNFs), impregnated with mixed-metal selenide nanoparticles (CoZnSe@CNTsCNFs), as high performance supercapacitors. CoZn hybrid zeolitic imidazolate framework-67 (CoZn 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 CoZn 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 CoZnSe@CNTsCNFs 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 CoZnSe@CNTsCNFs as the cathode and porous carbon nanofibers as the anode (denoted as CoZnSe@CNTsCNFs//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 15421.6 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 . Hierarchical tube-on-fiber carbon/mixed-metal selenide nanostructures (CoZnSe@CNTsCNFs) are constructed and exhibit high performance for hybrid supercapacitors.
Bibliography:10.1039/c9nr03088c
Electronic supplementary information (ESI) available: SEM images of Co-Zn-ZIFs-1 and XRD patterns of Co-Zn-ZIFs; XRD results of Co-Zn-C-1@CNTs-CNFs and Co-Zn-C-2@CNTs-CNFs; CV curves of ZnSe, ZnSe@CNF, and Co-Zn-Se-2@CNT-CNF electrodes at varied scan rates, GCD curves of ZnSe, ZnSe@CNF, and Co-Zn-Se-2@CNT-CNF electrodes; electrochemical properties of PCNFs: CV curves of PCNF electrodes at varied scan rates and GCD curves of PCNFs; electrochemical performance comparison of metal-selenide based supercapacitor electrodes; electrochemical performance comparison of the reported HSC devices. See DOI
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ISSN:2040-3364
2040-3372
2040-3372
DOI:10.1039/c9nr03088c