SYNTHESIS, STRUCTURE AND PHOTOELECTROCHEMICAL ACTIVITY OF MIXED COPPER-COBALT OXIDE COATINGS
AbstractThe aim of the current work was to obtain photoactive copper–cobalt oxide coatings on AISI 304 type stainless steel substrate. This work is relevant to the search of new photocatalysts suitable for water photosplitting. Mixed copper–cobalt oxide coatings were synthesized by heating for 3 h at 550 °C the mixtures of copper acetate hydrate Cu(CH3COO)2∙H2O and cobalt acetate tetrahydrate Co(CH3COO)2∙4H2O. The obtained coatings were characterized by X–ray diffraction (XRD), Fourier transform infrared (FT-IR), thermogravimetric–differential scanning microscopy (TG–DSC) and photovoltammetry. The experimental results revealed that mixed copper–cobalt oxide coatings are predominantly composed of spinel-type CuCo2O4 phase. The average crystallite size of CuCo2O4 particles was calculated to be in the range of 65–76 nm. The prepared coatings show a p-type semiconducting behavior. The value of photogenerated current depends on the molar ratio Cu:Co in the coatings. Unfortunately, photoelectrochemical measurements showed that these coatings are relatively unstable under UV irradiation in aqueous solutions.
TECHNOLOGY OF INORGANIC MATERIALS