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Ag/MnO2 Composite Sheath-Core Structured Yarn Supercapacitors
- Ag/MnO2 Composite Sheath-Core Structured Yarn Supercapacitors
- Kim, Ji Hwan; Choi, Changsoon; Lee, Jae Myeong; de Andrade, Monica Jung; Baughman, Ray H.; Kim, Seon Jeong
- DGIST Authors
- Choi, Changsoon
- Issue Date
- Scientific Reports, 8
- Article Type
- ELECTROCHEMICAL ENERGY-STORAGE; CARBON NANOTUBE YARN; SOLID-STATE; FLEXIBLE SUPERCAPACITORS; MICRO-SUPERCAPACITOR; ELECTRONIC TEXTILES; FIBERS; CAPACITOR; HYBRID; SYSTEM
- 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).
- Nature Publishing Group
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