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Facile synthesis of porous CoAl-layered double hydroxide/graphene composite with enhanced capacitive performance for supercapacitors

Title
Facile synthesis of porous CoAl-layered double hydroxide/graphene composite with enhanced capacitive performance for supercapacitors
Author
Hui, Kwan-San
Keywords
Layered double hydroxide; Gas-liquid interfacial method; Supercapacitor
Issue Date
2015-11
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ELECTROCHIMICA ACTA, v. 186, Page. 522-529
Abstract
Many studies reported that layered double hydroxide/graphene composite showed significant aggregation, which limited their electrochemical performance for supercapacitor. Here, a porous highly-uniform CoAl-layered double hydroxide/graphene (G-LDH) composite was fabricated as a supercapacitor electrode material using a simple gas-liquid interfacial method. The results showed that the proposed gas-liquid interfacial method allowed morphological control of CoAl-LDH and reduced the stacking of CoAl-LDH lamellar crystallites on graphene, leading to a porous structure with a specific surface area of 98.2 m(2) g(-1) and a pore volume of 0.42 cm(3) g(-1). The G-LDH sample achieved a specific capacitance of 479.2 F g(-1) at 1 A g(-1) and 341.2 F g(-1) at 10 A g(-1), which were much higher than those of the pure LDH sample fabricated by the gas-liquid interfacial method and the LDH/graphene sample synthesized by the conventional hydrothermal method. Moreover, the G-LDH composite exhibited long cycle stability with 93.9% of the specific capacitance (380.1 F g(-1)) retained at 3 A g-1 after 2000 cycles. This study provides a promising approach for the design and synthesis of porous layered double hydroxide/graphene composite with high capacitive performance, and can have potentially applications in energy storage. (C) 2015 Elsevier Ltd. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S0013468615307969?via%3Dihubhttp://hdl.handle.net/20.500.11754/28924
ISSN
0013-4686; 1873-3859
DOI
10.1016/j.electacta.2015.11.024
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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