Èlektrohimiâ
Russian Journal of Electrochemistry is an international journal covering all aspects of research in Pure and Applied Electrochemistry as well as in Electrochemical Materials Science.
Both original (full-size, short-communication and letter-to-editor types) and review manuscripts may be submitted in English or Russian by authors of any country(ies).
Media registration certificate: No. 0110270 dated 09.02.1993
Ағымдағы шығарылым
Ашық рұқсат
Рұқсат берілді
Тек жазылушылар үшін
Том 61, № 3 (2025)
Special issue based on the reports at the 17th International Meeting “Fundamental and Applied Problems of Solid State Ionics” (Chernogolovka, June 16–23, 2024)
High-entropy columbites: structure, optical and electrical properties
Аннотация
A high-entropy composition (Mg0.2Zn0.2Ni0.2Co0.2Mn0.2)Nb2O6 with a columbite structure and its Ti-substituted composition (5%) were synthesized. The synthesis was carried out using a modified method of combustion solutions followed by high-temperature sintering. X-ray analysis and scanning electron microscopy were used for characterization of the ceramics. According to diffuse reflectance spectra, the band gap of direct electronic transitions was calculated (Egdir ≈ 2.98–3.05 eV). Solid solutions are characterized predominantly by electronic conductivity. Substitution of niobium cations with titanium leads to an increase in conductivity by 1.2 orders of magnitude in the temperature range 160–750°C.
172-179
Synthesis and study of electric transport properties of REE polytungstates M10W22O81 (M–La, Nd)
Аннотация
The M10W22O81 (M–La, Nd, Ce) polytungstates of rare earth elements were synthesized by the solid-phase method and their electrical transport and thermal properties were studied. The electrical conductivity was measured by the electrochemical impedance method depending on the temperature and oxygen pressure in the gas phase. A combination of three methods (electrical conductivity versus oxygen pressure, transport numbers by the EMF method and the Tubandt method) established that the studied polytungstates are oxygen-ion conductors.
180-186
Regular articles
Voltammetric and discharge characteristics of hydrogen-chlorate current generator with sulfuric acid electrolyte
Аннотация
Operation of a single cell of redox-flow hydrogen-halogenate current generator which converts the energy of the oxidation reaction of gaseous hydrogen by sodium chlorate in aqueous sulfuric-acid solution into electric energy with the use of a membrane-electrode assembly of the composition: (–) H2, Pt–C // PEM // NaClO3, C (+) has been studied. A combined load operation regime (which includes stages of potentio- and galvanostatic control) has been applied, in order to take into account specific features of the chlorate electroreduction half-reaction, i. e. its redox-mediator autocatalytic mechanism (EC-autocat). For aqueous electrolytes containing various sulfuric acid contents, the system parameters determining the power and efficiency of the hydrogen-chlorate current generator have been established: faradaic and energy efficiencies, average discharge power and time to reach the steady-state mode. It has been found that the hydrogen-chlorate cell under study functions most efficiently for the 5 M sulfuric-acid electrolyte: such a cell has reached the constant-current mode to generate the 0.25 A/cm2 current density within one and a half minutes; it has been able to convert the chemical energy into the electric one with the 55% efficiency at the average specific discharge power of 0.23 W/cm2.
187-198