Microstructural Modification of NiAl Layered Double Hydroxide Electrodes by Adding Graphene Nanosheets and Their Capacitative Property

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.