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Microstructural Modification of NiAl Layered Double Hydroxide Electrodes by Adding Graphene Nanosheets and Their Capacitative Property
Author(s) -
Kim Yuna,
Kim Seok
Publication year - 2015
Publication title -
bulletin of the korean chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 59
ISSN - 1229-5949
DOI - 10.1002/bkcs.10129
Subject(s) - nial , materials science , graphene , cyclic voltammetry , composite number , supercapacitor , hydroxide , electrode , capacitance , chemical engineering , electrochemistry , dielectric spectroscopy , hydrothermal circulation , composite material , nanotechnology , chemistry , intermetallic , alloy , engineering
NiAl layered double hydroxide ( LDH ) composite electrodes containing various contents of graphene nanosheets ( GNS ) were prepared by a hydrothermal method. The micro‐structure and morphological properties were examined by FE‐SEM , FE‐TEM , XRD , and FTIR . Electrochemical analysis was also carried out by cyclic voltammetry, impedance, and cycle life measurement. The as‐prepared composite that contained 500 mg of graphene (denoted as NiAl /G‐50) achieved the highest specific capacitance of 1147 F/g among the various NiAl LDH / GNS composites. Besides, the NiAl LDH / GNS composite exhibited the lower diffusion resistance, improved rate capability, and good cyclic stability (83% of initial capacitance after 2000 cycles). Considering the morphological data and the improved capacitative properties together, we concluded the synthesized NiAl LDH / GNS composites would be a promising electrode material for supercapacitors.