Preparation and Study of Ti/TiO2,SbOx pH Electrodes

• Published in: Journal of analytical chemistry (New York, N.Y.) Vol. 75; no. 2; pp. 246 - 253
• Main Authors: Vasilyeva, M. S., Rudnev, V. S., Zabudskaya, N. E., Ustinov, A. Yu, Zasukhina, L. A., Marinina, G. I.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-02-2020; Springer Nature B.V
• Subjects: Alkalinity; Analytical Chemistry; Anatase; Antimony; Aqueous electrolytes; Chemistry; Chemistry and Materials Science; Composition; Electrodes; Morphology; Oxidation; Photoelectrons; Titanium; Titanium dioxide; Titration; pH-metry; plasma electrolytic oxidation; metal oxide electrodes; titanium oxide; antimony oxide
• ISSN: 1061-9348; 1608-3199
• DOI: 10.1134/S1061934820020173

Electrodes of the composition Ti/TiO
2
,SbO
x
were obtained by single-stage plasma electrolytic oxidation in aqueous electrolytes with antimony hydroxocomplexes. The surface morphology and composition of TiO
2
,SbO
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
2
and up to 1 at % of antimony as Sb
2
O
3
and Sb
2
O
5
. The resulting Ti/TiO
2
,SbO
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
3
COOH) acids with Ti/TiO
2
,SbO
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
2
,SbO
x
electrodes to determine the alkalinity of technogenic waters is shown.