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Issue 8, 2019
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Design of Mo-doped cobalt sulfide hollow nanocages from zeolitic imidazolate frameworks as advanced electrodes for supercapacitors

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Abstract

Construction of ternary metal sulfides with hollow nanostructures as energy storage materials is very promising yet challenging. Herein, we report a Mo-doped cobalt sulfide with a unique hollow nanocage structure (Mo-doped CoS HNC) by using ZIF-67 as a single sacrificial template through a dissolution–regrowth process in the presence of Na2MoO4 with an additional sulfurization process. The obtained Mo-doped CoS HNC exhibits an enhanced specific capacitance (781.0 F g−1 at 0.5 A g−1) compared with the control CoS HNC (387.1 F g−1) and CoMoO4–Co(OH)2 HNC (285.1 F g−1). Furthermore, it also shows a superior rate capacity of 52.0% under a 20-fold increase of current density (10 A g−1). An asymmetric supercapacitor (ASC) device assembled by using the Mo-doped CoS HNC as a positive electrode and activated carbon (AC) as a negative electrode displays a high energy density of 27.7 W h kg−1 at a power density of 799.9 W kg−1 with excellent cycling stability, showing that 88.0% of the initial capacitance is maintained after 10 000 cycles. The excellent electrochemical performance arises from the unique ternary metal sulfide hollow nanocage structure having a large surface area, facile diffusion of ions, good conductivity, and rich redox reactions as well as the synergistic effect between Mo and Co ions.

Graphical abstract: Design of Mo-doped cobalt sulfide hollow nanocages from zeolitic imidazolate frameworks as advanced electrodes for supercapacitors

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Supplementary files

Article information


Submitted
06 Jun 2019
Accepted
10 Jul 2019
First published
11 Jul 2019

Inorg. Chem. Front., 2019,6, 2178-2184
Article type
Research Article

Design of Mo-doped cobalt sulfide hollow nanocages from zeolitic imidazolate frameworks as advanced electrodes for supercapacitors

Z. Yang, Q. Ma, L. Han and K. Tao, Inorg. Chem. Front., 2019, 6, 2178
DOI: 10.1039/C9QI00663J

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