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

Zhang, Luojiang, Hui, Kwun Nam, Hui, Kwan San and Lee, Haiwon (2015) Facile synthesis of porous CoAl-layered double hydroxide/graphene composite with enhanced capacitive performance for supercapacitors. Electrochimica Acta, 186. pp. 522-529. ISSN 0013-4686

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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 m2 g-1 and a pore volume of 0.42 cm3 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.

Item Type: Article
Uncontrolled Keywords: gas-liquid interfacial method,graphene,layered double hydroxide,supercapacitor
Faculty \ School: Faculty of Science > School of Mathematics
Related URLs:
Depositing User: Pure Connector
Date Deposited: 24 Sep 2016 00:45
Last Modified: 22 Apr 2020 01:42
URI: https://ueaeprints.uea.ac.uk/id/eprint/60208
DOI: 10.1016/j.electacta.2015.11.024

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