Hybrid Polyaniline/Liquid Crystalline CNT Fiber Composite for Ultimate Flexible Supercapacitors
- Hybrid Polyaniline/Liquid Crystalline CNT Fiber Composite for Ultimate Flexible Supercapacitors
- 정현수; 김남동; 이동명; 김정길; 김민지; 정재영; 길명섭
- CNT fiber; conducting polymer; supercapacitor; flexible device
- Issue Date
- ACS applied energy materials
- VOL 4, NO 2-1142
- 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.
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