Structure, morphology and electrochemical properties of zinc-cobalt oxide films on AISI 304 type steel.

Zn-Co oxide films were prepd. by electrochem. deposition under potentiostatic conditions. The effects of synthesis conditions on structure, morphol., compn. and electrochem. properties of deposited films were studied by at. absorption spectroscopy, Fourier transform IR, XPS, X-ray diffraction, SEM and photovoltammetry anal. It has been detd. that the as-deposited films are lamellar with intercalated acetate ions, consisting of ZnO and α-Co(OH)2 phases. The annealed films retain the same structure without impurities and consist of wurtzite-type ZnO and spinel-type Co3O4. The photoelectrochem. performance and the specific capacitance of the prepd. electrodes were evaluated in 0.1 mol × L-1 NaOH aq. solns. The obtained exptl. results showed that the values of specific capacitance increase with the increase in the amt. of cobalt (hydr)oxide. On the contrary, the photoactivity decreases with the increase in cobalt content in the films. [on SciFinder(R)]