|
Abstract
|
Under ultrasound irradiation, NiFe-layered double hydroxide (NiFe-LDH) nanostructures with three molar ratios
and three dissimilar reaction times were prepared. The powder X-ray diffraction (XRD), field emission scanning
electron microscopy (FE-SEM), and Fourier transform infrared spectroscopy (FT-IR) were employed to characterize
the synthesized nanomaterials. Using a sonochemichal route, various morphologies of the NiFe-LDH
nanostructures without any impurity and variations in the structure were produced. During the optimization
process, it was found that sonication time and reagent concentration in a fixed irradiation frequency can affect
the size and the morphology of the produced nanostructures. Under ultrasound irradiation, non-aggregated
particles with uniform, spherical morphology were obtained with molar ratios of 4:1 (Ni:Fe) with 45W at
180 min. The NiFe-LDH samples were observed to be supercapacitor under a 6M KOH solution. When morphologically-
controlled NiFe-LDH samples were used, the pseudo-capacitive behavior of the nanostructures was
tuned. After 3 h of ultrasonic irradiation, the optimized sample (NiFe-LDH spherical nanostructures with 4:1M
ratio) had a high value of specific capacitance (168F g−1).
|