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Simple Route to Fiber-Shaped Heterojunctioned Nanocomposites for Knittable High-Performance Supercapacitors

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 MgS nanowire-drapped 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 interconnected MgS network, and manifest a more than two-fold discharging time over that of NiCo2S4. Notably, fiber-shaped asymmetric supercapacitors (denoted FASCs), assembled by intertwining a NiCo2S4@MgS positive electrode and a FeOOH negative electrode electrodeposited on the same type stainless steel microwire, deliver a remarkable specific volumetric capacity of 134.4 mAh cm-3, a high energy density of 107.5 mWh cm-3, and a good power density of 1.7 W cm-3 at 1 mA cm-2. More importantly, the FASCs also demonstrate a great stability with an 87.5% performance retention after 5000 cycles. Such hair-like FASCs enable the successful charging of an electronic bracelet, and could power light-emitting diodes (LEDs) after being woven into fabrics. As such, the two-step strategy present 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.

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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, Accepted Manuscript
Article type
Paper

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, Accepted Manuscript , DOI: 10.1039/D0TA04150E

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