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Highly conductive Ti3 C2 Tx MXene hybrid fibers for flexible and elastic fiber-shaped supercapacitors

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journal contribution
posted on 2019-02-22, 00:00 authored by Jizhen Zhang, Shayan Seyedin, Alex QinAlex Qin, Zhiyu Wang, Sepehr Moradi, Fangli Yang, Peter LynchPeter Lynch, Wenrong YangWenrong Yang, Jingquan Liu, Xungai Wang, Joselito RazalJoselito Razal
Fiber-shaped supercapacitors (FSCs) are promising energy storage solutions for powering miniaturized or wearable electronics. However, the scalable fabrication of fiber electrodes with high electrical conductivity and excellent energy storage performance for use in FSCs remains a challenge. Here, an easily scalable one-step wet-spinning approach is reported to fabricate highly conductive fibers using hybrid formulations of Ti3 C2 Tx MXene nanosheets and poly(3,4-ethylenedioxythiophene):polystyrene sulfonate. This approach produces fibers with a record conductivity of ≈1489 S cm-1 , which is about five times higher than other reported Ti3 C2 Tx MXene-based fibers (up to ≈290 S cm-1 ). The hybrid fiber at ≈70 wt% MXene shows a high volumetric capacitance (≈614.5 F cm-3 at 5 mV s-1 ) and an excellent rate performance (≈375.2 F cm-3 at 1000 mV s-1 ). When assembled into a free-standing FSC, the energy and power densities of the device reach ≈7.13 Wh cm-3 and ≈8249 mW cm-3 , respectively. The excellent strength and flexibility of the hybrid fibers allow them to be wrapped on a silicone elastomer fiber to achieve an elastic FSC with 96% capacitance retention when cyclically stretched to 100% strain. This work demonstrates the potential of MXene-based fiber electrodes and their scalable production for fiber-based energy storage applications.

History

Journal

Small

Volume

15

Issue

8

Article number

1804732

Pagination

1 - 9

Publisher

Wiley

Location

Chichester, Eng.

eISSN

1613-6829

Language

eng

Publication classification

C Journal article; C1 Refereed article in a scholarly journal

Copyright notice

2019, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim