STUDY OF THE CATALYTIC PROPERTIES OF ELECTRODES WITH AN ACTIVE ELECTROCATALYTIC COATING BASED ON A MIXTURE OF PALLADIUM, RUTENIUM, AND IRIDIUM OXIDES
Rubrics: 2. CHEMICAL TECHNOLOGY
Authors:
1.
Platov South-State Polytechnic University (Novocherkassk Politechnic Institute)
2.
PAO «GMK «Noril'skiy nikel'»
3.
Yuzhno-Rossiyskiy gosud. tehnich. un-t (Novocherkasskiy politehnicheskiy institut)
4.
Platov South-Russian State Polytechnic University
(Department of Chemical Technologies, assistant)
employee from 01.01.2022 to 01.01.2026
employee from 01.01.2022 to 01.01.2026
5.
Platov South-State Polytechnic University (Novocherkassk Politechnic Institute)
6.
Platov South-State Polytechnic University (Novocherkassk Politechnic Institute)
7.
Nacional'nyy issledovatel'skiy Nizhegorodskiy gosudarstvennyy universitet im. N.I. Lobachevskogo
Type:
Article
Pages:
from 51
to 56
Status:
Published
Received:
17.02.2026
Accepted:
13.03.2026
Published:
05.05.2026
Language:
Russian
Keywords:
ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY, RUTHENIUM OXIDE, IRIDIUM OXIDE, PALLADIUM OXIDE, TEMPERATURE-KINETIC ANALYSIS, MIXED METAL OXIDES (MMO) ELECTRODES, DIMENSIONALLY STABLE ANODE (DSA)
Abstract:
The article presents a comprehensive study of the catalytic and corrosion properties of titanium electrodes with an active electrocatalytic coating based on mixed palladium, ruthenium and iridium oxides (Pd-Ru-Ir-Ti systems). The relevance of the work is due to the need to increase the efficiency and selectivity of anodes used in the production of chlorine and sodium hypochlorite by optimizing the composition of their coating. Samples with different ratios of platinum group metal oxides were studied by a complex of physico-chemical methods: electrochemical impedance spectroscopy (EIS) and the temperature-kinetic method. An equivalent substitution scheme with two parallel branches was used to process electrochemical impedance spectroscopy data, which makes it possible to quantify the contribution of oxidative and adsorption catalysis mechanisms through the Rs1/Rs2 ratio. Based on the results obtained, the effective activation energies of the anodic oxidation of chloride ions are calculated. The experimental data was classified using the k-means method in the two-dimensional feature space "activation energy - Rs1/Rs2 ratio" followed by visualization of clusters using the Voronoi diagram in the Matlab automated computing system. This allowed us to identify four statistically significant groups of samples differing in the predominant mechanism of catalysis. It is shown that the addition of palladium oxide to the coating reduces the effective activation energy of the process to 6-9 kJ/mol and enhances the role of the adsorption mechanism. On the contrary, the predominance of ruthenium oxide promotes the implementation of oxidative catalysis, characterized by a higher activation energy (23-25 kJ/mol). The established correlations between the composition, mechanism of catalysis, and activation energy open up opportunities for the targeted design of highly efficient and selective anode materials.
The article presents a comprehensive study of the catalytic and corrosion properties of titanium electrodes with an active electrocatalytic coating based on mixed palladium, ruthenium and iridium oxides (Pd-Ru-Ir-Ti systems). The relevance of the work is due to the need to increase the efficiency and selectivity of anodes used in the production of chlorine and sodium hypochlorite by optimizing the composition of their coating. Samples with different ratios of platinum group metal oxides were studied by a complex of physico-chemical methods: electrochemical impedance spectroscopy (EIS) and the temperature-kinetic method. An equivalent substitution scheme with two parallel branches was used to process electrochemical impedance spectroscopy data, which makes it possible to quantify the contribution of oxidative and adsorption catalysis mechanisms through the Rs1/Rs2 ratio. Based on the results obtained, the effective activation energies of the anodic oxidation of chloride ions are calculated. The experimental data was classified using the k-means method in the two-dimensional feature space "activation energy - Rs1/Rs2 ratio" followed by visualization of clusters using the Voronoi diagram in the Matlab automated computing system. This allowed us to identify four statistically significant groups of samples differing in the predominant mechanism of catalysis. It is shown that the addition of palladium oxide to the coating reduces the effective activation energy of the process to 6-9 kJ/mol and enhances the role of the adsorption mechanism. On the contrary, the predominance of ruthenium oxide promotes the implementation of oxidative catalysis, characterized by a higher activation energy (23-25 kJ/mol). The established correlations between the composition, mechanism of catalysis, and activation energy open up opportunities for the targeted design of highly efficient and selective anode materials.
Keywords:
ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY, RUTHENIUM OXIDE, IRIDIUM OXIDE, PALLADIUM OXIDE, TEMPERATURE-KINETIC ANALYSIS, MIXED METAL OXIDES (MMO) ELECTRODES, DIMENSIONALLY STABLE ANODE (DSA)
ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY, RUTHENIUM OXIDE, IRIDIUM OXIDE, PALLADIUM OXIDE, TEMPERATURE-KINETIC ANALYSIS, MIXED METAL OXIDES (MMO) ELECTRODES, DIMENSIONALLY STABLE ANODE (DSA)
