Journal
CHEMISTRY OF MATERIALS
Volume 23, Issue 15, Pages 3509-3516Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm200975x
Keywords
graphene nanosheet; layered double hydroxides; composite electrode; supercapacitor
Funding
- Fundamental Research Funds of the Central University [HEUCF101010]
- Education Department of Heilongjiang Province [11553044]
- High Education Doctoral Fund [160100110010]
- Special Innovation Talents of Harbin Science and Technology [RC2011QN018009]
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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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