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Issue 46, 2016
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A high-performance flexible and weavable asymmetric fiber-shaped solid-state supercapacitor enhanced by surface modifications of carbon fibers with carbon nanotubes

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Abstract

To meet the demands of high energy storage and low productive cost as well as the ability to be incorporated into wearable electronics, we developed a flexible and weavable asymmetric fiber-shaped solid-state supercapacitor (a-FSSC) based on carbon fiber bundle@CNT–NiCo(OH)x (CF@CNC) and carbon fiber bundle@activated carbon (CF@AC) electrodes with increased operating voltage (1.4–1.6 V) and capacitance. For the positive electrode of CF@CNC, great electrochemical performance enhancement brought about by surface modifications with air plasma and carbon nanotube (CNT) coating is demonstrated. For the negative electrode of CF@AC, a facile and effective way of incorporating activated carbon into carbon fiber bundles is developed. The resultant assembled a-FSSC showed an areal energy and power density of 33.0 μW h cm−2 and 0.75 mW cm−2 at 1.6 V, which are better than those of most of the present fiber-shaped supercapacitors. The volumetric energy and power density of 0.84 mW h cm−3 and 19.1 mW cm−3 are also comparable to the reported results. Its long cycle life (100% capacitance retention after 8000 charge–discharge cycles) reveals its high electrochemical stability. High capacitance retention in the repeated bending (20% decay after 1000 bending times) and torsion (107% retention after 1000 twisting times) tests demonstrated the great flexibility, structural stability and potential utilization of the a-FSSC in wearable electronics. As a demonstration, a woolen fabric woven with three a-FSSCs connected in series can light a blue LED and be worn on the arm.

Graphical abstract: A high-performance flexible and weavable asymmetric fiber-shaped solid-state supercapacitor enhanced by surface modifications of carbon fibers with carbon nanotubes

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Publication details

The article was received on 22 Sep 2016, accepted on 25 Oct 2016 and first published on 26 Oct 2016


Article type: Paper
DOI: 10.1039/C6TA08233E
Citation: J. Mater. Chem. A, 2016,4, 18164-18173

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    A high-performance flexible and weavable asymmetric fiber-shaped solid-state supercapacitor enhanced by surface modifications of carbon fibers with carbon nanotubes

    X. Lu, Y. Bai, R. Wang and J. Sun, J. Mater. Chem. A, 2016, 4, 18164
    DOI: 10.1039/C6TA08233E

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