Preparation of NiO nanoparticles as supercapacitor electrode by precipitation using carbon black powder

Nickel oxide nanoparticles were synthesized by a simple aqueous solution method with carbon black powder. X-ray diffraction analysis shows that the mean size of the synthesized nickel oxide is 8.3 nm, which is much smaller than that obtained from other two methods without carbon black powder annealed at 350°C (21.1 nm) and with carbon black powder annealed at 600°C (15.6 nm). Accordingly, the specific capacitance in the first case is 161.4 Fg^-1, which is much larger than that of 139.1 and 11.5 Fg^-1 synthesized by the other two methods. Consequently, the method supplies a simple way to obtain super-fine electrode material for supercapacitor.