Synergetic design of enlarged surface area and pseudo-capacitance for fiber-shaped supercapacitor yarn
- Authors
- Thi Suong Le; Thuy Kieu Truong; Van Ngoc Huynh; Bae, Joonho; Suh, Dongseok
- Issue Date
- Jan-2020
- Publisher
- ELSEVIER
- Keywords
- Yarn/fiber supercapacitor electrode; Carbon nanotube yarn; Zinc oxide nanorod; Nickel-cobalt layered double hydroxide; Flexible symmetric supercapacitor yarn
- Citation
- NANO ENERGY, v.67
- Journal Title
- NANO ENERGY
- Volume
- 67
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/17652
- DOI
- 10.1016/j.nanoen.2019.104198
- ISSN
- 2211-2855
- Abstract
- In various wearable energy storage devices, the shape of fiber or yarn has many advantages owing to their compatibility with the environment in which they are deployed. We present a systematic approach to maximizing the capacitance of a supercapacitor yarn by significantly increasing the yarn's surface area by growing a high density of nanomds around the yarn, followed by coating the surface with a pseudo-capacitive material. The two-step strategy is implemented using a dry-spun carbon nanotube yarn-based electrode, which is surrounded by a zinc oxide nanorod forest that is coated by a pseudo-capacitive nickel-cobalt layered double hydroxide material. The flexible as-prepared electrode exhibits a maximum capacitance of 1065 mF cm(-2) (1278 F g(-1)) at a scan rate of 5 mV s(-1) and an excellent capacitance retention of 60.5% over 7000 cycles at a current density of 30 mA cm(-2). The outstanding performance of the composite yarn supercapacitor can be ascribed to the enhanced ion accessibility to the deep surface of the nickel-cobalt layered double hydroxide layer through the porous carbon nanotube yarn. Furthermore, the symmetric supercapacitor configuration demonstrated nearly 100% capacity retention at a bending angle of 150 degrees.
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