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Ag/MnO2 Composite Sheath-Core Structured Yarn Supercapacitors

Title
Ag/MnO2 Composite Sheath-Core Structured Yarn Supercapacitors
Author(s)
Kim, Ji HwanChoi, ChangsoonLee, Jae Myeongde Andrade, Monica JungBaughman, Ray H.Kim, Seon Jeong
DGIST Authors
Kim, Ji HwanChoi, ChangsoonLee, Jae Myeongde Andrade, Monica JungBaughman, Ray H.Kim, Seon Jeong
Issued Date
2018-09
Type
Article
Article Type
Article
Keywords
ELECTROCHEMICAL ENERGY-STORAGECARBON NANOTUBE YARNSOLID-STATEFLEXIBLE SUPERCAPACITORSMICRO-SUPERCAPACITORELECTRONIC TEXTILESFIBERSCAPACITORHYBRIDSYSTEM
ISSN
2045-2322
Abstract
One-dimensional (1D) yarn or fiber-based supercapacitors that have small diameter, volume and high mechanical strength are needed due to the demands on power source for wearable electronics, micro-devices, and implantable medical devices. The composite sheath is fabricated on a commercially available CNT yarn substrate by alternating depositions of MnO2 and Ag layers. Synergistic effect of high loading level of pseudocapacitive MnO2 and reasonably improved rate-capability are achieved. In the composite sheath, the interconnected networks provide electrical contact between MnO2 aggregates and adjacent Ag layer. The conductive Ag inter layers shorten the solid-state charge diffusion length in the MnO2. Moreover, generated electrons during the charge/discharge process can be collected rapidly by the adjacent Ag layer, therefore, the great extents of MnO2 could be loaded onto the surface of CNT core fiber electrode without a significant rate-capability degradation. Due to the high MnO2 loading level, the composite sheath-core yarn supercapacitor showed excellent specific areal capacitance (322.2 mF/cm2) and according energy density (18.3 µWh/cm2). © 2018, The Author(s).
URI
http://hdl.handle.net/20.500.11750/9346
DOI
10.1038/s41598-018-31611-2
Publisher
Nature Publishing Group
Files in This Item:
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Appears in Collections:
Division of Energy Technology 1. Journal Articles

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