(Invited) The Effect of Dopants on the Stabilization of the Cubic BSCF Phase in O2- and CO2-Containing Atmospheres. (3rd May 2017)

• Record Type: Journal Article
• Authors: Gerthsen, Dagmar; Meffert, Matthias; Störmer, Heike; Wilde, Virginia; Almar, Laura; Sigloch, Fabian; Unger, Lana-Simone; Wagner, Stefan F.; Ivers-Tiffée, Ellen
• Is Part Of: ECS transactions. Volume 77:Number 10(2017)
• Page Start: 35
• Page End: 39
• Publication Date: 2017-05-03
• Subjects: Electrochemistry -- Periodicals; Electrochemistry; Periodicals; Electronic journals; Electronic journal; 541.37
• DOI: 10.1149/07710.0035ecst
• Languages: English
• ISSNs: 1938-5862

Abstract

Abstract : The effect of Y-, Nb- and Ti-doping on the stability of the cubic (Ba0.5 Sr0.5 )(Co0.8 Fe0.2 )O3- d (c-BSCF) phase in O2 - and CO2 -containing atmospheres was studied in a temperature range between 640 and 880 °C. Electron microscopy investigations demonstrate that secondary phase formation in 10 at% Y-doped BSCF (BSCF10Y) is almost completely suppressed and XRD analyses on powders also show improved stability for 10 at% Nb- and Ti-doped BSCF. Furthermore, electrochemical impedance spectroscopy measurements of symmetrical cells in CO2 -containing atmospheres show significantly less poisoning effect on oxygen reduction reaction for BSCF10Y compared to undoped BSCF cathodes, while the latter developed a high density of small precipitates on the surface after exposure to CO2 .