Graphene Nanosheet/Ni<sup>2+</sup>/Al<sup>3+</sup> Layered Double-Hydroxide Composite as a Novel Electrode for a Supercapacitor

Zan Gao(Harbin Engineering University), Jun Wang(Harbin Engineering University), Zhanshuang Li(Harbin Engineering University), Wanlu Yang(Harbin Engineering University), Bin Wang(Harbin Engineering University), Mengjie Hou(Harbin Engineering University), Yang He(Harbin Engineering University), Qi Liu(Harbin Engineering University), Tom Mann(Harbin Engineering University), Piaoping Yang(Harbin Engineering University), Milin Zhang(Harbin Engineering University), Lianhe Liu(Harbin Engineering University)
Chemistry of Materials
July 7, 2011
10.1021/cm200975x
Cited by 536

Abstract

A hybrid chemically converted graphene nanosheet/Ni2+/Al3+ layered double-hydroxide (GNS/LDH) composite for supercapacitor material has been fabricated by a hydrothermal method. Scanning electron microscopy and transmission electron microscopy results reveal that Ni2+/Al3+ LDH platelets homogeneously grew onto the surfaces of the GNSs as spacers to keep the neighboring sheets separate. Electrochemical properties were characterized by cyclic voltammetry, galvanostatic charge/discharge measurements, and electrochemical impedance spectroscopy. The composite exhibits a maximum specific capacitance of 781.5 F/g and excellent cycle life with an increase of the specific capacitance of 38.07% after 50 cycle tests. Even after 200 cycle tests, the increase of the capacitance is 22.56% compared with the initial capacitance.

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