Controlled synthesis of MOF-derived quadruple-shelled CoS2 hollow dodecahedrons as enhanced electrodes for supercapacitors

Hollow nanostructures with high complexity in shell architectures have attracted tremendous interest in electrode materials for energy storage and conversion because of their unique structural features. However, the synthesis of delicate structures for hollow metal sulfides are still difficult. Here...

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Bibliographic Details
Published in:Electrochimica acta 2019-07, Vol.312, p.54-61
Main Authors: Jia, Henan, Wang, Zhaoyue, Zheng, Xiaohang, Cai, Yifei, Lin, Jinghuang, Liang, Haoyan, Qi, Junlei, Cao, Jian, Feng, Jicai, Fei, Weidong
Format: Article
Language:English
Subjects:
Activated carbon
Assembling
Cobalt oxides
Cobalt sulfide
Complexity
CoS2
Electrochemical analysis
Electrode materials
Electrodes
Energy storage
Flux density
Hollow structure
Hybrid supercapacitors
Metal sulfides
Metal-organic frameworks
Quadruple-shell
Stability
Supercapacitors
Synthesis
Zeolites
ZIF-67
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Summary:Hollow nanostructures with high complexity in shell architectures have attracted tremendous interest in electrode materials for energy storage and conversion because of their unique structural features. However, the synthesis of delicate structures for hollow metal sulfides are still difficult. Herein, we demonstrate the designed synthesis of porous quadruple-shelled CoS2 hollow dodecahedrons with the concave surfaces through a template engaged formation process. Uniform yolk-shell Co3O4 dodecahedrons are first synthesized from zeolitic imidazolate framework-67 and then transformed into quadruple-shelled CoS2 hollow dodecahedrons through the reaction with sulfur powder. As the result of the assembly of the advantages from materials and structures, when evaluating as electrodes for supercapacitors, the porous quadruple-shelled CoS2 shows a high specific capacity of 375.2 C g−1 with a good rate performance and excellent stability with 92.1% retention after 10000 cycles. Moreover, the assembling quadruple-shelled CoS2//active carbon asymmetric supercapacitor achieves a high energy density of 52.1 Wh kg−1, excellent specific capacitance (146 F g−1 at 0.5 A g−1), and electrochemical cycling stability (89% retention after 5000 cycles). The improved electrochemical performance of quadruple-shelled CoS2 hollow dodecahedrons demonstrates the importance of design of hollow electrodes materials with higher complexity. [Display omitted]
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2019.04.192