Hui, Kwan-San
2017-09-06T01:04:09Z
2017-09-06T01:04:09Z
2015-11
ELECTROCHIMICA ACTA, v. 186, Page. 522-529
0013-4686
1873-3859
http://www.sciencedirect.com/science/article/pii/S0013468615307969?via%3Dihub
http://hdl.handle.net/20.500.11754/28924
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.
This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2013R1A1A2007365 and 2014R1A1A2055740).
en
PERGAMON-ELSEVIER SCIENCE LTD
Layered double hydroxide
Gas-liquid interfacial method
Supercapacitor
Facile synthesis of porous CoAl-layered double hydroxide/graphene composite with enhanced capacitive performance for supercapacitors
Article
186
10.1016/j.electacta.2015.11.024
522-529
ELECTROCHIMICA ACTA
Zhang, Luojiang
Hui, Kwun Nam
Hui, Kwan San
Lee, Haiwon
2015000413
S
COLLEGE OF ENGINEERING[S]
DIVISION OF MECHANICAL ENGINEERING
kshui