Abstract
It has been proposed to use electrochemical oxidation of oxalic acid to create gas mixtures for calibrating carbon dioxide gas analyzers. The electrocatalytic properties of nickel and tin oxides obtained by thermal oxidation have been investigated. It has been established that the thermally produced tin oxides are of poor quality due to insufficient uniformity. The advantage of the titanium base to the aluminum one has been shown, which is associated with its greater tendency to passivation and stronger adhesion to electrolytic coatings. By the methods of voltammetry, the range of potentials, formed during galvanostatic polarization of oxide-metal electrodes, has been determined. The developed nickel oxide electrodes, formed by thermal oxidation of the titanium-based nickel layer, allow oxalic acid to be oxidized to CO2 with a high current efficiency in the range of current densities of 0.05 … 0.2 A/cm2.
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