Electrochemical stability of La0.6Sr0.4Co0.2Fe0.8O3−δ-infiltrated YSZ oxygen electrode for reversible solid oxide fuel cells

AbstractThe Ce0.8Gd0.2O2−δ (CGO) interlayer is commonly applied in solid oxide fuel cells (SOFCs) to prevent chemical reactions between the (La1−xSrx)(Co1−yFey)O3−δ (LSCF) oxygen electrode and the Y2O3-stabilized ZrO2 (YSZ) electrolyte. However, formation of the YSZ–CGO solid solution with low ionic conductivity and the SrZrO3 (SZO) insulating phase still happens during cell production and long-term operation, causing poor performance and degradation. Unlike many experimental investigations exploring these phenomena, consistent and quantitative computational modeling of the microstructure evolution at the oxygen electrode–electrolyte interface is scarce. We combine thermodynamic, 1D kinetic, and 3D phase-field modeling to computationally reproduce the element redistribution, microstructure evolution, and corresponding ohmic loss of this interface. The influences of different ceramic processing techniques for the CGO interlayer, i.e., screen printing and physical laser deposition (PLD), and of different processing and long-term operating parameters are explored, representing a successful case of quantitative computational engineering of the oxygen electrode–electrolyte interface in SOFCs.

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Characterization of Oxygen-Electrode/Electrolyte Interface Reactions in Solid Oxide Fuel Cells by X-Ray Diffraction Measurements

Materials Science Forum ◽

10.4028/www.scientific.net/msf.79-82.875 ◽

1991 ◽

Vol 79-82 ◽

pp. 875-882 ◽

Cited By ~ 1

Author(s):

E. Ivers-Tiffée ◽

B. Jobst ◽

Ivo Kraus ◽

R. Schachtner ◽

M. Schiessl

Keyword(s):

Fuel Cells ◽

Solid Oxide Fuel Cells ◽

Oxygen Electrode ◽

Solid Oxide ◽

Oxide Fuel ◽

X Ray Diffraction ◽

X Ray ◽

Interface Reactions ◽

Electrolyte Interface

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A Combined Variable-Temperature Neutron Diffraction and Thermogravimetric Analysis Study on a Promising Oxygen Electrode, SrCo0.9Nb0.1O3−δ, for Reversible Solid Oxide Fuel Cells

ACS Applied Materials & Interfaces ◽

10.1021/acsami.7b08697 ◽

2017 ◽

Vol 9 (40) ◽

pp. 34855-34864 ◽

Cited By ~ 13

Author(s):

Tianrang Yang ◽

Jie Wang ◽

Yan Chen ◽

Ke An ◽

Dong Ma ◽

...

Keyword(s):

Fuel Cells ◽

Thermogravimetric Analysis ◽

Neutron Diffraction ◽

Solid Oxide Fuel Cells ◽

Variable Temperature ◽

Oxygen Electrode ◽

Solid Oxide ◽

Oxide Fuel ◽

Analysis Study

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Ta-Doped SrCoO3−δ as a promising bifunctional oxygen electrode for reversible solid oxide fuel cells: a focused study on stability

Journal of Materials Chemistry A ◽

10.1039/c7ta02003a ◽

2017 ◽

Vol 5 (19) ◽

pp. 8989-9002 ◽

Cited By ~ 37

Author(s):

Jie Wang ◽

Tianrang Yang ◽

Libin Lei ◽

Kevin Huang

Keyword(s):

Fuel Cells ◽

Solid Oxide Fuel Cells ◽

Electrochemical Properties ◽

Oxygen Electrode ◽

Solid Oxide ◽

Intermediate Temperature ◽

Oxide Fuel

The present work reports a thorough investigation into the structural, thermal, electrical and electrochemical properties of 10 mol% Ta-doped SrCoO3−δ (denoted as SCT10) as a promising bifunctional oxygen electrode for intermediate-temperature reversible solid oxide fuel cells.

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