Adhesion of oxide scales grown on ferritic stainless steels in solid oxide fuel cells temperature and atmosphere conditions

The chapter introduces components and working principle of solid oxide fuel cells (SOFCs). It is followed by the explanation on the choices of materials focussing on ferritic stainless steels. The review is further made on the required properties of these steels, i.e. low oxidation rate, low chromium species volatilisation rate, high electrical conductivity and good scale adhesion. For the oxidation aspect, the behaviour of stainless steel interconnect in cathode, anode (hydrogen and biogas), and dual atmospheres are described. Surface modification by pre-oxidation and coatings to improve the oxide electrical conductivity and to reduce chromium species volatilisation is finally reviewed.

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Formation of Conductive Oxide Scale on 33NK and 47ND Interconnector Alloys for Solid Oxide Fuel Cells

Energies ◽

10.3390/en12244795 ◽

2019 ◽

Vol 12 (24) ◽

pp. 4795 ◽

Cited By ~ 1

Author(s):

Eremin ◽

Solodyankin ◽

Belyakov ◽

Khodimchuk ◽

Farlenkov ◽

...

Keyword(s):

Surface Modification ◽

Fuel Cells ◽

Solid Oxide Fuel Cells ◽

Solid Oxide ◽

Compatibility Study ◽

Oxide Fuel ◽

Structure And Properties ◽

Oxide Scales ◽

Good Adhesion ◽

Conductive Oxide

: Two grades of chromium-free alloys were studied in order to apply them as interconnectors for solid oxide fuel cells. The surface modification methods were proposed for each alloy with the purpose of forming of oxide scales considering the required physicochemical properties. Investigations of the structure and properties of the obtained oxide scales were performed and the efficiency of the chosen surface modification methods was approved. The samples with the surface modification exhibited higher conductivity values in comparison with the nonmodified samples. A compatibility study of samples with surface modification and glass sealant of chosen composition was accomplished. The modified samples demonstrated good adhesion during testing and electrical resistance less than 40 mOhm/cm2 at 850 °C in air, which allowed us to recommend these alloys with respective modified oxide scales as interconnectors for SOFC.

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Diffusion of Oxygen at Ceramic Interfaces for High-Temperature Solid Oxide Fuel Cells

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.242-244.129 ◽

2005 ◽

Vol 242-244 ◽

pp. 129-142 ◽

Cited By ~ 1

Author(s):

Teruhisa Horita ◽

Haruo Kishimoto ◽

Katsuhiko Yamaji ◽

Natsuko Sakai ◽

Yue Ping Xiong ◽

...

Keyword(s):

Fuel Cells ◽

Solid Oxide Fuel Cells ◽

Oxygen Diffusion ◽

Secondary Ion Mass Spectrometry ◽

Ceramic Materials ◽

Electrochemical Process ◽

Solid Oxide ◽

Oxide Ceramic ◽

Oxide Fuel ◽

Oxide Scales

Oxygen diffusion was measured at oxygen/cathode/electrolyte interfaces and at oxide scales/alloy interconnects in Solid Oxide Fuel Cells (SOFCs). A stable isotope oxygen exchange technique (16O/18O exchange) was adopted to label the diffusion profiles in the oxides, and secondary ion mass spectrometry (SIMS) depth profiles were examined to determine the diffusion coefficients in the oxide ceramic materials. Diffusivity of oxygen in LaMnO3 cathode was measured under polarized condition (that is, considering the electrochemical process and diffusion). Also, oxygen diffusion in the oxide scales formed on the alloy was measured to clarify the formation mechanism of oxide scale.

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