Solid Oxide Fuel Cell Cathodes: Polarization Mechanisms and Modeling of the Electrochemical Performance

Abstract

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Electrode redox properties of Ba1−xLaxFeO3−δ as cobalt free cathode materials for intermediate-temperature SOFCs

“…8(a) exhibits the impedance spectra of BL91F at 650 C under different applied cathodic potential. The cathodic potential is favorable for oxygen reduction process due to the increased oxygen vacancy concentration [44]. Fig.…”

Effect of time and polarization on kinetics of the oxygen electrode reaction at an Au∣YSZ interface

“…However, a controversy still persists over the mechanism and kinetics of processes occurring at an interface electrode|YSZ electrolyte [6][7][8][9][10]. This problem is of key importance for the SOFCs, where apart from the ohmic drop, slow kinetics of electrode processes is a source of significant energy losses.…”

Combustion synthesis and characterization of LSCF-based materials as cathode of intermediate temperature solid oxide fuel cells

“…(M is a transitional metal, Mn or Fe) has found significant attention [5][6][7][8][9][10][11] because of their superior MIEC behavior [5][6][7][8] as well as enhanced ORR kinetics. [9][10][11][12][13][14][15] The La(Sr)Co(Fe) (LSCF)-based cathodes, in particular, are reported to be very effective for IT-SOFC (700-800 • C) application when coupled with a Gd-doped ceria (CGO)-based interlayer.…”

“…For this purpose, several new compositions showing mixed ionic and electronic conductivity (MIEC) have been investigated as promising SOFC cathodes. [1][2][3][4][5][6][7][8][9][10][11] Amongst these, the perovskite-based compounds having the general formula La 1−x Sr x M 1−y Co y O 3 , where 0 < x ≤ 0.5 and 0 < y ≤ 0.8 * Corresponding author. Tel.…”

“…[9][10][11][12][13][14][15] The La(Sr)Co(Fe) (LSCF)-based cathodes, in particular, are reported to be very effective for IT-SOFC (700-800 • C) application when coupled with a Gd-doped ceria (CGO)-based interlayer. 5,6,11,12 This is mainly due to high ionic conductivity in CGO electrolyte, compared to conventional 8 mol% yittria-stabilized zirconia (8-YSZ) together with its favorable coefficient of thermal expansion (CTE). While the CTE values of YSZ and CGO electrolytes are 10.8 × 10 −6 K −1 and 12.8 × 10 −6 K −1 , respectively, for LSCF-based cathodes it is found to be much higher (>17 × 10 −6 K −1 ).…”