Hybrid Polyaniline/Liquid Crystalline CNT Fiber Composite for Ultimate Flexible Supercapacitors

Title
Hybrid Polyaniline/Liquid Crystalline CNT Fiber Composite for Ultimate Flexible Supercapacitors
Authors
정현수김남동이동명김정길김민지정재영길명섭
Keywords
CNT fiber; conducting polymer; supercapacitor; flexible device
Issue Date
2021-02
Publisher
ACS applied energy materials
Citation
VOL 4, NO 2-1142
Abstract
CNT fibers (CNTFs) are excellent platforms for fiber-shaped supercapacitors, offering both high electric conductivity and mechanical resilience. Here, we propose a polyaniline (PANI)/CNTF composite structure that utilizes a state-of-the-art liquid-crystal (LC)-spun CNTF as the ultimate conductive and flexible electrode. CNTFs assume a highly dense LC phase with a high electrical conductivity of 14 kS cm?1, which is similar to that of its metal counterpart and suitable as a good current collector. Pseudocapacitive PANI can be homogeneously polymerized directly onto the smooth surface of the CNTFs by using the sonochemical polymerization method. The optimized synthetic process produces PANI in a favorable chemical state with good contact properties at the CNTF interface, exhibiting a high capacitance (738 F g?1 at 1 A g?1) even at an extremely fast charge/discharge rate (604 F g?1 at 100 A g?1). Moreover, the superior mechanical resilience of the CNTFs enables excellent flexibility, showing a negligible capacitance decay after 15?000 bending cycles, even with tight knots in the middle. These results highlight the excellent potential of highly densified CNTFs in next-generation flexible supercapacitors for practical wearable applications.
URI
http://pubs.kist.re.kr/handle/201004/73050
ISSN
2574-0962
Appears in Collections:
KIST Publication > Article
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