Preparation and Study of Ti/TiO.sub.2,SbO.sub.x pH Electrodes

Electrodes of the composition Ti/TiO.sub.2,SbO.sub.x were obtained by single-stage plasma electrolytic oxidation in aqueous electrolytes with antimony hydroxocomplexes. The surface morphology and composition of TiO.sub.2,SbO.sub.x layers deposited on titanium were studied by scanning electron microscopy, X-ray diffraction analysis, and X-ray photoelectron spectroscopy. The obtained layers contain anatase TiO.sub.2 and up to 1 at % of antimony as Sb.sub.2O.sub.3 and Sb.sub.2O.sub.5. The resulting Ti/TiO.sub.2,SbO.sub.x electrodes were tested as pH sensors. They have close to Nernst electrode function in the pH range from 2 to 10 (53 ± 1 mV/pH). In the acid-base titration of strong (HCl) and weak (CH.sub.3COOH) acids with Ti/TiO.sub.2,SbO.sub.x electrodes, potential jumps are obtained that are not inferior in magnitude to the potential jump for a glass electrode. A possibility of using Ti/TiO.sub.2,SbO.sub.x electrodes to determine the alkalinity of technogenic waters is shown.
Author(s): M. S. Vasilyeva [sup.1] [sup.2], V. S. Rudnev [sup.1] [sup.2], N. E. Zabudskaya [sup.1] [sup.2], A. Yu. Ustinov [sup.1] [sup.2], L. A. Zasukhina [sup.1], G. I. Marinina [sup.1] Author [...]