Исследование электрокаталитических свойств неорганических сложнооксидных соединений со структурой двойного перовскита
Аннотация
"Investigation of the electrocatalytic properties of inorganic complex oxide compounds with a double perovskite structure."
Explanatory note 73 p., 35 figures, 11 tables, 99 bibliography names.
Keywords: ENZYME-FREE SENSOR, ELECTROCHEMICAL SENSOR, DOUBLE PEROVSITES, COBALTITES, HYDROGEN PEROXIDE, SELF-POWER SENSOR, FUEL CELL
The object of the study was ordered and disordered complex oxides with a perovskite structure PrBaCo2-xNixO6-δ (x = 0; 0.1; 0.2; 0.3); PrBaMn2O6-δ and Pr0.5Ba0.5MnO3-δ.
Purpose of the work: investigation of the electrocatalytic properties of perovskites ordered along the A-sublattice with respect to hydrogen peroxide
The results of the study showed that the use of double perovskites as electrocatalysts significantly increases the electrochemical response to hydrogen peroxide and, as a consequence, improves the sensory properties, presumably due to an increase in the rate of oxygen diffusion from the depth of the crystal to its surface due to the stable anisotropy of ionic conductivity. The most sensitive to the oxidation of hydrogen peroxide is the electrode modified with cobaltite with 5% nickel substitution. In addition, disordered manganite, due to the presence of oxygen vacancies, is capable of electrocatalytically oxidizing hydrogen peroxide. At the same time, ordered manganite lacks oxygen nonstoichiometry and can only reduce hydrogen peroxide due to the variable oxidation state of the transition metal.
A setup was set up to simultaneously measure the current and voltage of the electrochemical cell in the power generation mode. With this setup, it is possible to record polarographic curves without superimposing an external potential, as well as the dependence of the current and power density on the concentration of the analyte in the solution. In the power generation mode, the same tendencies are observed in relation to the reactions of conversion of hydrogen peroxide. The concept of an electrochemical cell with two working electrodes was proposed. For this, a number of experiments were carried out to select the appropriate pair to create an electrochemical cell that combines a stable and sensitive hydrogen peroxide sensor and a fuel cell. The electrochemical cell will generate a stable current only if one of the electrodes catalyzes only the oxidation (PBC/GCE), and the other only the reduction (PBMO6/GCE) of hydrogen peroxide.
Explanatory note 73 p., 35 figures, 11 tables, 99 bibliography names.
Keywords: ENZYME-FREE SENSOR, ELECTROCHEMICAL SENSOR, DOUBLE PEROVSITES, COBALTITES, HYDROGEN PEROXIDE, SELF-POWER SENSOR, FUEL CELL
The object of the study was ordered and disordered complex oxides with a perovskite structure PrBaCo2-xNixO6-δ (x = 0; 0.1; 0.2; 0.3); PrBaMn2O6-δ and Pr0.5Ba0.5MnO3-δ.
Purpose of the work: investigation of the electrocatalytic properties of perovskites ordered along the A-sublattice with respect to hydrogen peroxide
The results of the study showed that the use of double perovskites as electrocatalysts significantly increases the electrochemical response to hydrogen peroxide and, as a consequence, improves the sensory properties, presumably due to an increase in the rate of oxygen diffusion from the depth of the crystal to its surface due to the stable anisotropy of ionic conductivity. The most sensitive to the oxidation of hydrogen peroxide is the electrode modified with cobaltite with 5% nickel substitution. In addition, disordered manganite, due to the presence of oxygen vacancies, is capable of electrocatalytically oxidizing hydrogen peroxide. At the same time, ordered manganite lacks oxygen nonstoichiometry and can only reduce hydrogen peroxide due to the variable oxidation state of the transition metal.
A setup was set up to simultaneously measure the current and voltage of the electrochemical cell in the power generation mode. With this setup, it is possible to record polarographic curves without superimposing an external potential, as well as the dependence of the current and power density on the concentration of the analyte in the solution. In the power generation mode, the same tendencies are observed in relation to the reactions of conversion of hydrogen peroxide. The concept of an electrochemical cell with two working electrodes was proposed. For this, a number of experiments were carried out to select the appropriate pair to create an electrochemical cell that combines a stable and sensitive hydrogen peroxide sensor and a fuel cell. The electrochemical cell will generate a stable current only if one of the electrodes catalyzes only the oxidation (PBC/GCE), and the other only the reduction (PBMO6/GCE) of hydrogen peroxide.