ELECTROOXIDATION OF LOWER MONATOMIC ALCOHOLS ON RUTHENIUM DIOXIDE
Rubrics: 2. CHEMICAL TECHNOLOGY
Authors:
1.
Udmurt State University
(, Department of Fundamental and Applied Chemistry, Institute of Natural Sciences)
graduate student from 01.01.2025 until now
Izhevsk, Russian Federation
graduate student from 01.01.2025 until now
Izhevsk, Russian Federation
2.
Udmurtskiy gosud. universitet
Type:
Article
Pages:
from 86
to 92
Status:
Published
Received:
17.02.2026
Accepted:
13.03.2026
Published:
05.04.2026
Language:
Russian
Keywords:
RUTHENIUM DIOXIDE, MONATOMIC ALCOHOLS, ELECTROCATALYSIS, ELECTROCHEMICAL OXIDATION
Abstract:
This paper presents the results of a study of the catalytic properties of ruthenium dioxide in the electrooxidation reactions of lower monatomic alcohols C1-C3 by cyclic voltammetry. The anode catalyst was obtained by thermochemical decomposition of RuOHCl3 salt on anodized titanium. The process of electrochemical oxidation of alcohols on the studied modified electrode is determined, on the one hand, by the nature of the alcohol, and, on the other, by the nature of the electrolyte. It has been established that the oxidation of alcohols occurs in both acidic and alkaline environments. In acidic electrolytes (H2SO4, HClO4), conditions are created for a higher rate of the current-forming oxidation reaction of alcohols compared with alkaline media, apparently due to the higher proton conductivity of ruthenium dioxide in acid solutions. The oxidation currents of alcohols increase as the acid concentration decreases, and the inverse relationship is observed for an alkaline medium. At the same time, the oxidation rate in solutions of perchloric acid is higher and the oxidation potential is lower than in sulfuric acid. However, in an acidic environment, the activity of the catalyst decreases faster with time, which may be due to poisoning of the latter with oxidation products. The oxidation of alcohols in all studied electrolytes occurs irreversibly. It is shown that the rate of oxidation of alcohols decreases with the transition from C1 to C3. The dependence of the oxidation current on the alcohol concentration (0.1 ÷ 1 M) is linear. The results of the influence of the potential expansion rate and temperature on the oxidation current indicate the diffusion control of the anode reaction. An increase in temperature increases the rate of the oxidation reaction. In general, the RuO2/Ti anodic catalyst is inferior to platinum in terms of the efficiency of alcohol oxidation.
This paper presents the results of a study of the catalytic properties of ruthenium dioxide in the electrooxidation reactions of lower monatomic alcohols C1-C3 by cyclic voltammetry. The anode catalyst was obtained by thermochemical decomposition of RuOHCl3 salt on anodized titanium. The process of electrochemical oxidation of alcohols on the studied modified electrode is determined, on the one hand, by the nature of the alcohol, and, on the other, by the nature of the electrolyte. It has been established that the oxidation of alcohols occurs in both acidic and alkaline environments. In acidic electrolytes (H2SO4, HClO4), conditions are created for a higher rate of the current-forming oxidation reaction of alcohols compared with alkaline media, apparently due to the higher proton conductivity of ruthenium dioxide in acid solutions. The oxidation currents of alcohols increase as the acid concentration decreases, and the inverse relationship is observed for an alkaline medium. At the same time, the oxidation rate in solutions of perchloric acid is higher and the oxidation potential is lower than in sulfuric acid. However, in an acidic environment, the activity of the catalyst decreases faster with time, which may be due to poisoning of the latter with oxidation products. The oxidation of alcohols in all studied electrolytes occurs irreversibly. It is shown that the rate of oxidation of alcohols decreases with the transition from C1 to C3. The dependence of the oxidation current on the alcohol concentration (0.1 ÷ 1 M) is linear. The results of the influence of the potential expansion rate and temperature on the oxidation current indicate the diffusion control of the anode reaction. An increase in temperature increases the rate of the oxidation reaction. In general, the RuO2/Ti anodic catalyst is inferior to platinum in terms of the efficiency of alcohol oxidation.
Keywords:
RUTHENIUM DIOXIDE, MONATOMIC ALCOHOLS, ELECTROCATALYSIS, ELECTROCHEMICAL OXIDATION
RUTHENIUM DIOXIDE, MONATOMIC ALCOHOLS, ELECTROCATALYSIS, ELECTROCHEMICAL OXIDATION
