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Issue 40, 2017
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Binder-free WS2 nanosheets with enhanced crystallinity as a stable negative electrode for flexible asymmetric supercapacitors

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Abstract

Tungsten disulfide (WS2) has been emerging as an attractive electrode material for supercapacitors because of its intrinsically layered structure and high capacitance. Unfortunately, most of the currently developed WS2-based electrodes suffer from poor conductivity and fast capacitance fading. In this work, we demonstrated that the durability of WS2 nanosheets can be remarkably boosted via improving their crystallinity and the first example of using these WS2 nanosheets as a high-energy and stable negative electrode for flexible asymmetric supercapacitors (ASCs). Electrochemical results reveal the WS2 nanosheets with enhanced crystallinity were able to deliver an excellent durability with more than 82% capacitance retention after 10 000 cycles and an areal capacitance of 0.93 F cm−2 at 4 mA cm−2. Importantly, when using the as-prepared WS2 nanosheets as a negative electrode, a flexible and stable ASC device with an extraordinary volumetric energy density of 0.97 mW h cm−3 is obtained. This work affords new opportunities to use WS2 nanostructures and other 2D TMDs in constructing high-performance energy-storage devices.

Graphical abstract: Binder-free WS2 nanosheets with enhanced crystallinity as a stable negative electrode for flexible asymmetric supercapacitors

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Publication details

The article was received on 09 Aug 2017, accepted on 15 Sep 2017 and first published on 16 Sep 2017


Article type: Paper
DOI: 10.1039/C7TA07009H
Citation: J. Mater. Chem. A, 2017,5, 21460-21466
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    Binder-free WS2 nanosheets with enhanced crystallinity as a stable negative electrode for flexible asymmetric supercapacitors

    S. Liu, Y. Zeng, M. Zhang, S. Xie, Y. Tong, F. Cheng and X. Lu, J. Mater. Chem. A, 2017, 5, 21460
    DOI: 10.1039/C7TA07009H

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