Preparation of Nickel Tungstate (NiWO4) Nanoparticles and Characterization with Electrochemical Methods in Combination with Mott-Schottky Theory

Nickel tungstate is an interesting semiconductor for application in solar cell owing to its low band gap¹, high mechanical stability and abundant oxygen sites (4 oxygen/Ni-W) for dye molecule absorption. Nanoparticle nickel tungstate has been synthesized with different methods including solid state², direct mechanical rout³ and standard ceramic rout⁴. In current study nickel tungstate has been synthesized with different particle size distribution using co-precipitation⁵ method (N1) and in microemulsion medium in presence of cetyltrimethylammonium bromide (CTAB) as surfactant (N2).

Synthesized samples were examined using XRD, TEM and DRS methods. Electrochemical impedance spectroscopy method in combination with mott-schottky theory has been applied for determination of electronic specification of all samples. Furthermore, light transformation efficiency of samples for application in solar cell has been studied using gratzel two-electrode cell.