Optical and electrochemical properties of nanosized NiO via thermal decomposition of nickel oxalate nanofibres

Nickel oxide nanoparticles with an average diameter of about 9 nm were synthesized via thermal decomposition of NiC 2 O 4 precursor at 450 C. The nanoparticles were investigated using XRD, TEM, TGA, and UV-vis spectrophotometry.The optical absorption spectrum indicates that the NiO nanoparticles have a direct band gap of 3.56 eV.The electrochemical tests show that the ultrafine NiO nanoparticles, as a promising electrode material, can deliver a large reversible discharge capacity of about 610 mA h g -1 .