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Issue 8, 2019
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Ultrasmall-sized SnS nanosheets vertically aligned on carbon microtubes for sodium-ion capacitors with high energy density

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Abstract

Sodium ion hybrid capacitors (SHCs) using battery-type and capacitor-type electrodes are designed to obtain both high energy and power densities. However, anode materials commonly cannot meet the high capacity and rapid charging/discharging stability requirements. With the help of sandwiched design, herein novel porous carbon microtubes are sandwiched by vertical ultrasmall-sized SnS nanosheets (SnS/aCMT) via combined solvothermal and thermal-treatment approaches. The three-dimensional interconnected SnS nanosheet network grown on both sides of the hollow carbon microtubes could greatly prevent their aggregation and facilitate ion transport, which endows the anode material with improved specific capacity and structural stability. As a result, the SnS/aCMT electrode presents high capacity (517 mA h g−1 at 0.1 A g−1) and remarkable rate capability (306 mA h g−1 even at 5 A g−1) as well as long-term cycling stability with 88.7% retention over 500 cycles. Furthermore, a SHC, assembled by using SnS/aCMT as the anode and aCMT as the cathode, presents a high energy density of 115 W h kg−1 in the voltage range of 0.5–4.0 V and stable long-term cycling performance.

Graphical abstract: Ultrasmall-sized SnS nanosheets vertically aligned on carbon microtubes for sodium-ion capacitors with high energy density

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Publication details

The article was received on 05 Jan 2019, accepted on 25 Jan 2019 and first published on 25 Jan 2019


Article type: Paper
DOI: 10.1039/C9TA00141G
Citation: J. Mater. Chem. A, 2019,7, 4047-4054

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    Ultrasmall-sized SnS nanosheets vertically aligned on carbon microtubes for sodium-ion capacitors with high energy density

    J. Zhao, G. Wang, R. Hu, K. Zhu, K. Cheng, K. Ye, D. Cao and Z. Fan, J. Mater. Chem. A, 2019, 7, 4047
    DOI: 10.1039/C9TA00141G

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