Journal
NANO LETTERS
Volume 17, Issue 4, Pages 2719-2726Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b00854
Keywords
Carbon nanotubes; fibers; vanadium nitride; coaxial; asymmetric supercapacitors
Categories
Funding
- National Natural Science Foundation of China [51522211, 51372265, 51528203, 51602339]
- National Key Research and Development Program of China [2016YFA0203301]
- Key Research Program of Frontier Science of Chinese Academy of Sciences [QYZDB-SSW-SLH031]
- Natural Science Foundation of Shanghai [16ZR1439400, 17ZR1447700]
- Thousand Youth Talents Plan, the Postdoctoral Foundation of China [2016M601905]
- Natural Science Foundation of Jiangsu Province, China [BK20160399, BK20140392]
- Transformation of Scientific and Technological Achievements in Jiangsu Province [BA2016026]
- Postdoctoral Foundationof Jiangsu Province [1601065B]
- Science and Technology Project of Suzhou, China [SZS201508, ZXG201428, ZXG201401]
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The emergence of fiber-shaped supercapacitors (FSSs) has led to a revolution in portable and wearable electronic devices. However, obtaining high energy density FSSs for practical applications is still a key challenge. This article exhibits a facile and effective approach to directly grow well-aligned three-dimensional vanadium nitride (VN) nano wire arrays (NWAs) on carbon nanotube (CNT) fiber with an ultrahigh specific capacitance of 715 mF/cm(2) in a three electrode system. Benefiting from their intriguing structural features, we successfully fabricated a prototype asymmetric coaxial FSS (ACFSS) with a maximum operating voltage of 1.8 V. From core to shell, this ACFSS consists of a CNT fiber core coated with VN@C NWAs as the negative electrode, Na2SO4 poly(vinyl alcohol) (PVA) as the solid electrolyte, and MnO2/conducting polymer/CNT sheets as the positive electrode. The novel coaxial architecture not only fully enables utilization of the effective surface area and decreases the contact resistance between the two electrodes but also, more importantly, provides a short pathway for the ultrafast transport of axial electrons and ions. The electrochemical results show that the optimized ACFSS exhibits a remarkable specific capacitance of 213.5 mF/cm(2) and an exceptional energy density of 96.07 mu Wh/cm(2), the highest areal capacitance and areal energy density yet reported in FSSs. Furthermore, the device possesses excellent flexibility in that its capacitance retention reaches 96.8% after bending 5000 times, which further allows it to be woven into flexible electronic clothes with conventional weaving techniques. Therefore, the asymmetric coaxial architectural design allows new opportunities to fabricate high-performance flexible FSSs for future portable and wearable electronic devices.
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