Published November 2000 | Version v1
Journal article Metadata-only

Electrochemical activity of solid solutions La(1-x)SrxCoO3 in the oxygen electroreduction reaction in carbonate melts

Creators

  • 1. Inst. Vysokotemperaturnoj Ehlektrokhimii Ural'skogo Otdeleniya RAN, Ekaterinburg (Russian Federation)

Description

Solid solutions La(1-x)SrxCoO3 were synthesized. By the X-ray phase analysis it was ascertained that a rhombohedrically distorted perovskite-like phase was formed. Kinetics and mechanism of oxygen electroreduction on the synthesized materials in Li2CO3-K2CO3 melts (62:38 mol.%) and Na2CO3-Co2CO3 ones (39:61 mol.%) were studied by the methods of coulostatics and chronoamperometry. It was ascertained that the value of exchange current increases with increase in the content of strontium in the sample. A new mechanism is suggested, in which oxygen ions transfer from solid phase into melt with the relevant changes in electronic subsystem of the electrode material is the limiting stage

Abstract (Russian)

Синтезированы твердые растворы La(1-x)SrxCoO3. Рентгеновским фазовым анализом установлено образование ромбоэдрически искаженной перовскитоподобной фазы. Методами кулоностатики и хроноамперометрии исследованы кинетика и механизм электровосстановления кислорода на синтезированных материалах в расплавах Li2CO3-K2CO3 (62:38 мол.%) и Na2CO3-Co2CO3 (39:61 мол.%). Установлено, что величина тока обмена возрастает с увеличением содержания стронция в образце. Предложен новый механизм восстановления кислорода, в котором лимитирующей стадией является переход ионов кислорода из твердой фазы в расплав с соответствующими изменениями в электронной подсистеме материала электрода

Additional details

Additional titles

Original title (Russian)
Электрохимическая активност' твердых растворов Ла

Publishing Information

Journal Title
Ehlektrokhimiya
Journal Volume
36
Journal Issue
11
Journal Page Range
p. 1400-1405
ISSN
0424-8570
CODEN
ELKKAX

INIS

Country of Publication
Russian Federation
Country of Input or Organization
Russian Federation
INIS RN
33007770
Subject category
S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
Descriptors DEI
ALKALI METAL COMPOUNDS; CARBONATES; CHEMICAL COMPOSITION; CHEMICAL PREPARATION; CHEMICAL REACTION KINETICS; COBALT OXIDES; ELECTROCHEMISTRY; ELECTRODES; ELECTROLYTES; LANTHANUM OXIDES; MOLTEN SALTS; OXYGEN; PHASE STUDIES; REDUCTION; SOLID SOLUTIONS; STRONTIUM OXIDES
Descriptors DEC
ALKALINE EARTH METAL COMPOUNDS; CARBON COMPOUNDS; CHALCOGENIDES; CHEMICAL REACTIONS; CHEMISTRY; COBALT COMPOUNDS; DISPERSIONS; ELEMENTS; HOMOGENEOUS MIXTURES; KINETICS; LANTHANUM COMPOUNDS; MIXTURES; NONMETALS; OXIDES; OXYGEN COMPOUNDS; RARE EARTH COMPOUNDS; REACTION KINETICS; SALTS; SOLUTIONS; STRONTIUM COMPOUNDS; SYNTHESIS; TRANSITION ELEMENT COMPOUNDS

Optional Information

Notes
17 refs.; 2 tabs.; 2 figs.