Journal
JOURNAL OF POWER SOURCES
Volume 318, Issue -, Pages 76-85Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2016.04.010
Keywords
Layered double hydroxide; Nickel foam; Graphene; Binder-free; Hybrid supercapacitor; Liquid-phase deposition
Funding
- National Research Foundation of Korea - Ministry of Education, Science and Technology [2014R1A1A2055740]
- Research & Development Office at University of Macau [SRG2015-00057-FST]
- National Research Foundation of Korea [2014R1A1A2055740] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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