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Sandwich-Structured Transition Metal Oxide/Graphene/Carbon Nanotube Composite Yarn Electrodes for Flexible Two-Ply Yarn Supercapacitors
- Qiang ZhouQiang ZhouSchool of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, P. R. ChinaMore by Qiang Zhou
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- Xiuhang ChenXiuhang ChenSchool of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, P. R. ChinaMore by Xiuhang Chen
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- Fenghua Su*Fenghua Su*Email: [email protected]. Tel/Fax: +86-20-82313996.School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, P. R. ChinaMore by Fenghua Su
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- Xiaoming LyuXiaoming LyuSchool of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, P. R. ChinaMore by Xiaoming Lyu
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- Menghe Miao*Menghe Miao*Email: [email protected]CSIRO Materials Science and Engineering, P.O. Box 21, Belmont, Victoria 3216, AustraliaMore by Menghe Miao
Abstract
Carbon nanotube (CNT) yarn has been regarded as a perfect electrode material for linear flexible supercapacitors. However, the supercapacitors composed of pure CNT yarn electrodes always have lower specific capacitance and energy density. In this work, a pseudocapacitive material composed of a transition metal oxide mixture (Co3O4@NiO) is electrodeposited on the CNT yarn surface and followed by coating of a layer of graphene (GN) to improve the electrochemical performances of the as-fabricated flexible supercapacitor. The deposited NiO@Co3O4 and the coated GN on the CNT yarn surface form a uniform hybridized CNT/Co3O4@NiO/GN layer like a sandwich. The two-ply yarn supercapacitor based on the sandwich-structured CNT/Co3O4@NiO/GN composite yarn displays excellent electrochemical properties with a volumetric capacitance of 263.34 F/cm3 at 0.01 V/s. The two-ply yarn supercapacitor also shows a high energy density of 5.86 mWh/cm3 and a power density of 263.64 mW/cm3. In addition, the high electrochemical performance of the two-ply CNT/Co3O4@NiO/GN yarn supercapacitor is flexible and can be knitted into fabrics for wearable electronic devices.
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