Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 560, Issue -, Pages 237-246Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2019.10.032
Keywords
Electrochemical modification; Graphite fibers; NiCo-LDH nanoflakes; FeOOH nanosheets; Fiber asymmetric supercapacitors
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Funding
- Qingdao Innovation Leading Talent Program
- China Postdoctoral Science Foundation [RZ1900011127]
- National Talent Introducing Base for Discipline Innovation at Universities (111 plan)
- Shandong Provincial Natural Science Foundation [ZR2018BEM020]
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A fiber asymmetric supercapacitor system is designed with NiCo-LDH nanoflakes and FeOOH nanosheets anchored on electrochemically activated graphite fibers as positive electrode and negative electrode, respectively. Due to the formation of C-O-Metal bonding, the oxygen-functionalized carbon on electrochemically activated graphite fibers can bind strongly with NiCo-LDH and FeOOH, which assists in establishing the fast electron transfer routes and fluent ion transport avenues. Both NiCo-LDH and FeOOH anchored on electrochemically activated graphite fibers display a high rate performance, 80% and 87.3% of the electric capacity can be reserved with the current density increasing from 2 to 20 A g(-1) and 2 to 10 A g(-1), respectively, while the NiCo-LDH and FeOOH deposited on untreated graphite fibers can only retain 45% and 40%. The fabricated novel solid-state fiber asymmetric supercapacitor device exhibits an expanded operation potential window of 1.8 V with a maximum energy density (130 W h kg(-1)) when the power density is 1.8 kW kg(-1). Furthermore, a high energy density (81 W h kg(-1)) is still achieved at a superhigh power density (10.8 kW kg(-1)). Additionally, a good cycling stability of the solid-state fiber asymmetric supercapacitor can be obtained (90% capacity retention after 10,000 cycles). (C) 2019 Elsevier Inc. All rights reserved.
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