Flexible and Wearable All‐Solid‐State Supercapacitors with Ultrahigh Energy Density Based on a Carbon Fiber Fabric Electrode |
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| Authors: | Tianfeng Qin Shanglong Peng Jiaxin Hao Yuxiang Wen Zilei Wang Xuefeng Wang Deyan He Jiachi Zhang Juan Hou Guozhong Cao |
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| Affiliation: | 1. Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, School of Physical Science and Technology, Lanzhou University, Lanzhou, P. R. China;2. Shanghai Lishuo Composite Material Technology Co. Ltd., Shanghai, P. R. China;3. Department of Materials Science and Engineering, University of Washington, Seattle, WA, USA |
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| Abstract: | Wearable textile energy storage systems are rapidly growing, but obtaining carbon fiber fabric electrodes with both high capacitances to provide a high energy density and mechanical strength to allow the material to be weaved or knitted into desired devices remains challenging. In this work, N/O‐enriched carbon cloth with a large surface area and the desired pore volume is fabricated. An electrochemical oxidation method is used to modify the surface chemistry through incorporation of electrochemical active functional groups to the carbon surface and to further increase the specific surface area and the pore volume of the carbon cloth. The resulting carbon cloth electrode presents excellent electrochemical properties, including ultrahigh areal capacitance with good rate ability and cycling stability. Furthermore, the fabricated symmetric supercapacitors with a 2 V stable voltage window deliver ultrahigh energy densities (6.8 mW h cm?3 for fiber‐shaped samples and 9.4 mW h cm?3 for fabric samples) and exhibit excellent flexibility. The fabric supercapacitors are further tested in a belt‐shaped device as a watchband to power an electronic watch for ≈9 h, in a heart‐shaped logo to supply power for ≈1 h and in a safety light that functions for ≈1 h, indicating various promising applications of these supercapacitors. |
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| Keywords: | all‐solid‐state symmetric supercapacitors carbon fiber cloth flexible and wearable ultrahigh energy density |
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