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

Zhang, Luojiang, Hui, Kwun Nam, Hui, Kwan San ORCID: https://orcid.org/0000-0001-7089-7587 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 (former - to 2024)
UEA Research Groups:	Faculty of Science > Research Groups > Energy Materials Laboratory
Related URLs:	http://www.scopus.com/inward/record.url?...
Depositing User:	Pure Connector
Date Deposited:	24 Sep 2016 00:45
Last Modified:	25 Sep 2024 12:11
URI:	https://ueaeprints.uea.ac.uk/id/eprint/60208
DOI:	10.1016/j.electacta.2015.11.024

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