Wydział Chemii

Paweł D. Dziewoński

Maria Grzeszczuk

2009

Electrochimica Acta

54

4045-4055

10.1016/j.electacta.2009.02.036

Naukowa

Angielski

Artykuł

Thin layers of anatase TiO₂, up to 1 μm, were produced on the surface of a platinum electrode by means of cycling voltammetry from the aqueous solutions of the peroxo-oxalate complexes and the oxalate complexes of titanium(IV). Mechanisms of TiO₂ electrodeposition as well as different electrochemical reactions causing pH changes at the electrode were studied. The electroreduction processes of hydrogen peroxide and nitrite ion on platinum cause the highest pH changes. Values of the molar ratio of Ti(IV)/H₂O₂ should be kept closely to 0.5.In all cases studied, the electrodeposition led to the partially decomposed amorphous oxalate compounds of titanium(IV), which can be converted into crystalline anatase above 500 °C in air. The thermal behaviour of TiO₂ precursor compounds was examined by DRIFTS and TG–DTA methods. Strong effects of K⁺ and NH₄⁺ ions on the electrodeposition process were found by using of the EQCM technique, Raman spectroscopy and XRD measurements. The ammonium electrolyte warrants purity of the anatase phase. Morphology of the oxide films produced in different solvents was examined by SEM.

Electrodeposition of TiO2, Electrogeneration of pH changes, Aqueous chemistry of titanium(IV), CV, EQCM

https://doi.org/10.1016/j.electacta.2009.02.036

http://www.elsevier.com