期刊
NANO RESEARCH
卷 11, 期 4, 页码 1775-1786出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-017-1795-9
关键词
fiber-based supercapacitors; ferric-cobalt-nickel ternary oxide nanowire arrays; polyaniline-derived carbon nanorods; flexibility
类别
资金
- National Key R&D Program of China [2017YFB0406000]
- Key Research Program of Frontier Science of Chinese Academy of Sciences [QYZDB-SSW-SLH031]
- Natural Science Foundation of Jiangsu Province, China [BK20160399, BK20140392]
- Transformation of Scientific and Technological Achievements in Jiangsu Province [BA2016026]
- Postdoctoral Foundation of Jiangsu Province [1601065B]
- Science and Technology Project of Suzhou, China [SZS201508, ZXG201428, ZXG201401]
Fiber-based supercapacitors (FSCs) are new members of the energy storage family. They present excellent flexibility and have promising applications in lightweight, flexible, and wearable devices. One of the existing challenges of FSCs is enhancing their energy density while retaining the flexibility. We developed a facile and cost-effective method to fabricate a highly capacitive positive electrode based on hierarchical ferric-cobalt-nickel ternary oxide nanowire arrays/graphene fibers and a negative electrode based on polyaniline-derived carbon nanorods/graphene fibers. The elegant microstructures and excellent electrochemical performances of both electrodes enabled us to construct a high-performance flexible asymmetric graphene fiber-based supercapacitor device with an operating voltage of 1.4 V, a specific capacitance up to 61.58 mF.cm(-2), and an energy density reaching 16.76 mu W.h.cm(-2). Moreover, the optimal device presents an outstanding cycling stability with 87.5% initial capacitance retention after 8,000 cycles, and an excellent flexibility with a capacitance retention of 90.9% after 4,000 cycles of repetitive bending.
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