▎ 摘　　要

Graphene nanosheets (GNS)/CoAl-layered double hydroxide (CoAl-LDH) composite with a laminated structure is fabricated by a simple refluxing method. It is found that CoAl-LDH lamellar crystallites gradually self-assemble on the graphene oxide (GO) which is reduced to GNS during the refluxing procedure in the presence of urea. The GNS/CoAl-LDH composite has a higher specific surface area (23.4 m(2) g(-1)) and superior electrochemical performance. As electrode material for supercapacitors, the composite shows a maximum specific capacitance of 711.5 F g(-1) at low current density of 1 A g(-1), and it remains 516.8 F g(-1) when the current density increase to 10 A g(-1). Furthermore, the capacitance keeps at least about 81% (compare with 64% for that of pure LDH) after 2000 cycles at 10 A g(-1), indicating the composite has excellent high-current capacitive behavior. (C) 2011 Elsevier B.V. All rights reserved.