Abstract
NiO nanoparticles (NiO-1 and NiO-2) were synthesized by the calcination of NiCl2·6H2O/benzoic acid and salicylic acid, respectively, with weight ratio 1:1 at temperature 600 °C. They were characterized by Fourier transform infrared (FT-IR), UV–Vis and photoluminecence spectroscopy, X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Their electrochemical properties were evaluated using cyclic voltammetry, galvanostatic charge/discharge measurement and electrochemical impedance spectroscopy. The final products have good electrochemical reversibility and show large specific capacitance of about 479 mA h g−1 and 388 mA h g−1 after 50 cycles at 100 mA g−1. The NiO nanoparticles electrodes exhibit also excellent rate capability. Nearly 37% and 40% specific capacity retention were observed after the current density had increased from 100 to 1000 mA g−1.
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