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High-performance hybrid supercapacitor with 3D hierarchical porous flower-like layered double hydroxide grown on nickel foam as binder-free electrode

Title
High-performance hybrid supercapacitor with 3D hierarchical porous flower-like layered double hydroxide grown on nickel foam as binder-free electrode
Author
Hui, Kwan-San
Keywords
Layered double hydroxide; Nickel foam; Graphene; Binder-free; Hybrid supercapacitor; Liquid-phase deposition
Issue Date
2016-04
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF POWER SOURCES, v. 318, Page. 76-85
Abstract
The synthesis of layered double hydroxide (LDH) as electroactive material has been well reported; however, fabricating an LDH electrode with excellent electrochemical performance at high current density remains a challenge. In this paper, we report a 3D hierarchical porous flower-like NiAl-LDH grown on nickel foam (NF) through a liquid-phase deposition method as a high-performance binder-free electrode for energy storage. With large ion-accessible surface area as well as efficient electron and ion transport pathways, the prepared LDH-NF electrode achieves high specific capacity (1250 C g(-1) at 2 A g(-1) and 401 C g(-1) at 50 A g(-1)) after 5000 cycles of activation at 20 A g(-1) and high cycling stability (76.7% retention after another 5000 cycles at 50 A g-1), which is higher than those of most previously reported NiAl-LDH-based materials. Moreover, a hybrid supercapacitor with LDH-NF as the positive electrode and porous graphene nanosheet coated on NF (GNS-NF) as the negative electrode, delivers high energy density (30.2 Wh kg(-1) at a power density of 800 W kg(-1)) and long cycle life, which outperforms the other devices reported in the literature. This study shows that the prepared LDH-NF electrode offers great potential in energy storage device applications. (C) 2016 Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0378775316303512?via%3Dihubhttp://hdl.handle.net/20.500.11754/49801
ISSN
0378-7753; 1873-2755
DOI
10.1016/j.jpowsour.2016.04.010
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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