Electrocatalytic Properties and Nonstoichiometry of the High Temperature Air Electrode La1 − x Sr x MnO3

Abstract

Two electrochemical techniques have been applied to characterize the electrocatalytic properties of Lal_=Sr=MnO~ for the high-temperature reduction of oxygen. The results are correlated with accurate thermogravimetric measurements. The electrocatalytic behavior is ascribed to mobile oxide vacancies generated by the cathodic polarization. The electrode potential at which this process becomes efficient varies significantly with the strontium dopant concentration.

Fabrication and performance of Pr-doped CeO2 nanorods-impregnated Sr-doped LaMnO3–Y2O3-stabilized ZrO2 composite cathodes for intermediate temperature solid oxide fuel cells

“…Though many new materials (mostly having mixed ionic and electronic conduction, MIEC) have been developed as potential candidates for cathodes in solid oxide fuel cells (SOFCs), the preferred material for industrial applications is still strontium doped lanthanum manganate (La 1Àx Sr x MnO 3 , LSM), thanks to its high electronic conductivity, 1,2 high catalytic/electrocatalytical activity for oxygen reduction reaction (ORR), 3,4 and extraordinary thermal 5,6 and chemical compatibility 7,8 with the most commonly used electrolyte material (yttria-stabilized zirconia, YSZ). However, the intrinsically poor ionic conduction characteristic of LSM confines the active zone for ORR to the electrode-electrolyte interface, [9][10][11] limiting its further development as a cathode used in the intermediate temperature range (600-800 C), at which not only the service life of cell component materials could be extended but also the choice of cost effective interconnecting materials is possible.…”

Reversible Decomposition of Secondary Phases in BaO Infiltrated LSM Electrodes—Polarization Effects

“…Under 0.1 atm O 2 in Ar, Ba 3 Mn 2 O 8 showed a strong dependence on the applied electrical polarization where cathodic polarization promoted decomposition and anodic polarization promoted the regeneration of Ba 3 Mn 2 O 8 on the LSM electrode. Cathodic polarization has the same effect on LSM electrodes as very low oxygen partial pressures, a condition that promotes the formation of oxygen vacancies . Continued exposure to high cathodic polarization conditions and/or low the oxygen partial pressure ultimately leads to decomposition of LSM electrodes and will also decompose complex oxides like Ba 3 Mn 2 O 8 .…”

Preparation of green body of La0.8Sr0.2MnO3 by gelcasting forming process

“…The solid loading 50 vol% suspension was obtained by adjusting pH to [8][9]. And then, the suspension was de-aired in vacuum, and an initiator ammonium persulfate ((NH 4 ) 2 S 2 O 4 ) was added to the above suspension and mixed homogeneously by stirring.…”

“…Sr (or Ca)-doped perovskite-type LaMnO 3 materials is a promising material extensively used for magnetic materials [6,7], cathode [8,9], catalysis [10,11]. Doped LaMnO 3 materials are commonly prepared by the dry-pressing process.…”