Electrodes based on nanodispersed titanium and tungsten oxides for oxygen sensor

G.Ya. Kolbasov^a, V.S.Vorobets^a, A.M. Korduban^b,

I.G. Kolbasova^c, O.V. Linyucheva^c

^aInstitute of General & Inorganic Chemistry, 32-34 prosp. Palladina, 03680 Kiev -142, Ukraine

^bInstitute of Metal Physics, 36 Acad. Vernadsky Blvd., 03680, Kiev-142, Ukraine

^cNational Technical University, 37 prosp. Pobedy, 03056 Kiev- 56, Ukraine

Electrodes for the determination of oxygen dissolved in biologically active liquids have been developed, the operation of which is based on the oxygen electroreduction process. The cathode materials were nanodispersed titanium and tungsten oxides. TiO₂ nanoparticles were produced by sol-gel method on a Ti substrate from a solution containing titanium chloride; after which the electrodes were annealed in air at 550-600 ⁰C. WO₃ nanoparticles were produced by method of electrical explosion of W wire in an oxygen-containing atmosphere. The mean size of nanoparticles on the electrode surface depended on the conditions of their production, was no more then 7 nm for TiO₂ nanoparticles, and varied between 5 and 50 nm for WO₃ nanoparticles; the average thickness of the layers produced was 500-2000 nm. The thickness of the electrodes was 0.2-0.3 mm. It has been found by XPS measurements that the surface of the electrodes is formed from nonstoichiometric tungsten oxide WO_2.76∙(OH)_0.24, titanium oxideTiO_1.91∙(OH)_0.09, and their hydroxide phases.

The kinetics and mechanism of oxygen electroreduction at TiO₂ and WO₃ electrodes in blood plasma and a physiological NaCl solution have been investigated. The maximum sensitivity of the electrodes investigated to dissolved oxygen was achieved at cathodic potentials of -0.6 to -1.0 V (with respect to silver-chloride electrode) and was (4-5)∙10^-6 g/l.

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