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Facile Method for Preparation of Three-Dimensional CNT Sponge and Nanoscale Engineering Design for High Performance Fiber-Shaped Asymmetrical Supercapacitors

Abstract

Fiber supercapacitors (FSCs) have great application potential in future smart textiles, portable and wearable electronics because of their flexibility, tiny volume and wearability. Their main limitation, however, is the low energy density when compared with batteries, which seriously restricts its practical application. How to enhance their energy densities while retaining their high-power densities is a critical challenge for fiber-shaped supercapacitor development. Here, we first fabricated three-dimensional CNT sponge (3DCS) by a facile electrochemical activation and freeze-drying method, then a fiber-shaped 3DCS/polyaniline nanocomposites fiber is synthesized by in situ electro-polymerization. Through a rational nanoscale electrode engineering design, the resultant fibers show a specific capacitances as high as 242.9 F cm-1 in 1 M H2SO4. Furthermore, asymmetric fiber-shaped supercapacitor (FASC) was assembled using 3DCS/P as the positive electrode and 3DCS as the negative electrode, respectively. After optimization, the FASC delivers a high energy density of 30.92 µWh cm-2, which is about 2 times higher than that of the highest reported previously, and maintaining a maximum power density (1.78 mW cm-2) more than two orders of magnitude higher than those of micro-batteries, and an outstanding mechanical stability of 90.2% specific capacitance retained after 1000 bending cycles. In view of the excellent electrochemical characteristics and the simple manufacturing of the high conductivity and flexible 3DCS/P, this offers new opportunities for designing long-life wearable FSCs with high-energy density and high-power density.

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Publication details

The article was received on 31 Jul 2017, accepted on 05 Oct 2017 and first published on 05 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA06722D
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Facile Method for Preparation of Three-Dimensional CNT Sponge and Nanoscale Engineering Design for High Performance Fiber-Shaped Asymmetrical Supercapacitors

    Y. Li, Z. Kang, X. Yan, S. Cao, M. Li, Y. Liu, S. Liu, Y. Sun, X. Zheng and Y. Zhang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA06722D

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