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Issue 23, 2020
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A simple route to fiber-shaped heterojunctioned nanocomposites for knittable high-performance supercapacitors

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Abstract

Fiber-shaped supercapacitors with high energy density have been an active subject of research due to their promising prospect for use in portable and wearable electronics. Herein, we report on a robust two-step strategy for crafting a MgS nanowire-draped NiCo2S4 nanosheet network (i.e., NiCo2S4@MgS nanocomposites) in situ grown on ultrafine flexible stainless steel microwires to render knittable supercapacitors with markedly enhanced performance. The two-step route involves the formation of oxide compounds, followed by their conversion into NiCo2S4@MgS nanocomposites. In sharp contrast to pure NiCo2S4 nanosheets, NiCo2S4@MgS nanocomposites facilitate a rapid charge transport between NiCo2S4 nanosheets and MgS nanowires due to the presence of the interconnected MgS network and manifest a more than two-fold discharging time over that of NiCo2S4. Notably, fiber-shaped asymmetric supercapacitors (denoted as FASCs), assembled by intertwining a NiCo2S4@MgS positive electrode and a FeOOH negative electrode electrodeposited on the same type of stainless steel microwires, deliver a remarkable specific volumetric capacity of 134.4 mA h cm−3, a high energy density of 107.5 mW h cm−3, and a good power density of 1.7 W cm−3 at 1 mA cm−2. More importantly, the FASCs also demonstrate great stability with 87.5% performance retention after 5000 cycles. Such hair-like FASCs enable the successful charging of an electronic bracelet, and can power light-emitting diodes (LEDs) after being woven into fabrics. As such, the two-step strategy in this study may represent a viable means of yielding a variety of metal-containing oxide, sulfide, and nitride networks on stainless steel microhairs for high-performance and light-weight wearable electronics.

Graphical abstract: A simple route to fiber-shaped heterojunctioned nanocomposites for knittable high-performance supercapacitors

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Supplementary files

Article information


Submitted
18 Apr 2020
Accepted
11 May 2020
First published
11 May 2020

J. Mater. Chem. A, 2020,8, 11589-11597
Article type
Paper

A simple route to fiber-shaped heterojunctioned nanocomposites for knittable high-performance supercapacitors

X. Zhang, X. Chen, T. Bai, J. Chai, X. Zhao, M. Ye, Z. Lin and X. Liu, J. Mater. Chem. A, 2020, 8, 11589
DOI: 10.1039/D0TA04150E

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