Effect of coatings on long term behaviour of a commercial stainless steel for solid oxide electrolyser cell interconnect application in H 2 /H 2 O atmosphere

Abstract Kubota Alloy HD (UNS J93005) is a heat-resisting stainless steel casting alloy suitable for long-term service at temperatures up to 1095 deg C (2000 deg F). The nearest wrought equivalent is type 327. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as creep. It also includes information on corrosion resistance as well as casting and joining. Filing Code: SS-1110. Producer or source: Kubota Metal Corporation, Fahramet Division.

Download Full-text

KUBOTA ALLOY HC

Alloy Digest ◽

10.31399/asm.ad.ss1065 ◽

2010 ◽

Vol 59 (5) ◽

Keyword(s):

Stainless Steel ◽

Corrosion Resistance ◽

Physical Properties ◽

Tensile Properties ◽

Steel Casting

Abstract Kubota Alloy HC is a heat resisting stainless steel casting suitable for long term service at temperatures up to 1093 deg C (2000 deg F). This alloy can maintain resistance to sulfur bearing environments up to 1093 deg C (2000 deg F). This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on corrosion resistance as well as casting and joining. Filing Code: SS-1065. Producer or source: Kubota Metal Corporation, Fahramet Division.

Download Full-text

Computational engineering of the oxygen electrode-electrolyte interface in solid oxide fuel cells

npj Computational Materials ◽

10.1038/s41524-021-00584-8 ◽

2021 ◽

Vol 7 (1) ◽

Author(s):

Kaiming Cheng ◽

Huixia Xu ◽

Lijun Zhang ◽

Jixue Zhou ◽

Xitao Wang ◽

...

Keyword(s):

Fuel Cells ◽

Solid Oxide Fuel Cells ◽

Microstructure Evolution ◽

Oxygen Electrode ◽

Solid Oxide ◽

Ohmic Loss ◽

Oxide Fuel ◽

Computational Engineering ◽

Electrolyte Interface

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.

Download Full-text

Microstructure Evolution in a Solid Oxide Fuel Cell Stack Quantified with Interfacial Free Energy

Energies ◽

10.3390/en14123476 ◽

2021 ◽

Vol 14 (12) ◽

pp. 3476

Author(s):

Tomasz A. Prokop ◽

Grzegorz Brus ◽

Janusz S. Szmyd

Keyword(s):

Free Energy ◽

Fuel Cell ◽

Solid Oxide Fuel Cell ◽

Microstructure Evolution ◽

Ion Beam ◽

Solid Oxide ◽

Oxide Fuel ◽

Long Term Performance ◽

Term Performance

Degradation of electrode microstructure is one of the key factors affecting long term performance of Solid Oxide Fuel Cell systems. Evolution of a multiphase system can be described quantitatively by the change in its interfacial energy. In this paper, we discuss free energy of a microstructure to showcase the anisotropy of its evolution during a long-term performance experiment involving an SOFC stack. Ginzburg Landau type functional is used to compute the free energy, using diffuse phase distributions based on Focused Ion Beam Scanning Electron Microscopy images of samples taken from nine different sites within the stack. It is shown that the rate of microstructure evolution differs depending on the position within the stack, similar to phase anisotropy. However, the computed spatial relation does not correlate with the observed distribution of temperature.

Download Full-text