Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 40, Pages 44866-44873Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c14221
Keywords
wearable; wire-shaped electrode; yarn electrode; carbon fiber; supercapacitor
Funding
- China Postdoctoral Science Foundation [2019T120285, 2018M641884]
- Natural Science Foundation of Hebei Province of China [E2020204030]
- Heilongjiang Province Postdoctoral Science Foundation [LBH-Z18235]
- Youth Science and Technology Innovation Project [RCYJTD201803, RCCXYJ201805]
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Wire-shaped supercapacitors (WSCs) are promising in wearable electronics but still face critical challenges of limited energy density. Nanostructured materials are dominant in high-performance active materials for improving energy density but are generally limited to wire-shaped electrodes (WSEs) with low mass loading (<0.5 mg cm(-1)) because of sluggish ionic kinetics in thicker electrodes. To address this problem, we report here the treatment of microstructured carbon fiber (CF) via a surface engineering strategy, which adopts controllable oxygen (O) functional groups on the CF surface with both highly redox-active sites and fast electron/ion transport. By combining a knitting method, we demonstrate that a WSE with high mass loading (similar to 6.1 mg cm(-1)) can operate at ultrahigh capacitance (435.1 mF cm(-1), 1539.7 mF cm(-2), and 68.4 mF cm(-3)), exceeding that of most of the reported WSEs. An assembled WSC delivers up to 195.3 mF cm(-1) and 33 mu W h cm(-1), surpassing the best carbon symmetric supercapacitor known, and even conducting polymers and metal oxide asymmetric devices. Thus, this work provides a viable method for a high-mass WSE and will stimulate the development of WSCs toward practical applications.
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