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Binder-free WS2 Nanosheets with Enhanced Crystallinity as Stable Negative Electrode for Flexible Asymmetric Supercapacitors

Abstract

Tungsten disulfide (WS2) has been emerging as an attractive electrode material for supercapacitors for its intrinsically layered structure and high capacitance. Unfortunately, most of the current developed WS2-based electrodes suffer from poor conductivity and fast capacitance fading. In this work, we demonstrated that the durability of the WS2 nanosheets can be remarkably boosted via improving their crystallinity and the first example of using these WS2 nanosheets as high-energy and stable negative electrode for flexible asymmetric supercapacitors (ASCs). Electrochemical results reveal the WS2 nanosheets with enhanced crystallinity was able to deliver an excellent durability with more than 82% of capacitance retention after 10000 cycles and an areal capacitance of 0.93 F/cm2 at 4 mA/cm2. Importantly, when using the as-prepared WS2 nanosheets as negative electrode, a flexible and stable ASC device with an extraordinary volumetric energy density of 0.97 mWh/cm3 is obtained. This work affords new opportunities to use WS2 nanostructure and other 2D TMDs in constructing high-performance energy-storage devices.

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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, Accepted Manuscript
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    Binder-free WS2 Nanosheets with Enhanced Crystallinity as 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, Accepted Manuscript , DOI: 10.1039/C7TA07009H

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