Strontium transport and conductivity of Mn1.5Co1.5O4 coated Haynes 230 and Crofer 22 APU under simulated solid oxide fuel cell condition

Chen, Lei; Magdefrau, Neal J.; Sun, Ellen Y.; Yamanis, Jean; Frame, Dustin; Burila, Charles

doi:10.1016/j.ssi.2011.10.004

Cited by 17 publications

(9 citation statements)

References 28 publications

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“…This small difference in k p can likely be attributed to the relatively dense coating achieved by pack cementation, in our work. Chen et al also found that when the substrate was changed from Crofer 22 APU to Haynes 230, the k p of the Mn 1.5 Co 1.5 O 4 -coated substrate decreased to 1.94 9 10 -15 g 2 cm -4 s -1 , which is lower than the value obtained in our work [26]. Hua et al prepared a MnCo 2 O 4 spinel coating on the surface of a SUS 430 ferritic stainless steel, by a sol-gel process [27].…”

Section: Microstructure and Composition Of Isothermal Oxidized Coatingcontrasting

confidence: 82%

Oxidation and Electrical Behavior of Mn-Co-Coated Crofer 22 APU Steel Produced by a Pack Cementation Method for SOFC Interconnect Applications

Ebrahimifar

Zandrahimi

2015

Oxid Met

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An issue associated with chromia-scale formation on ferritic stainless steels is an associated increase in electrical resistance over time, due to the oxide growth. Further, the migration of chromium via chromia-scale evaporation into solid oxide fuel cell (SOFC) cathodes can result in degradation in cell electrochemical performance. In this research, manganese and cobalt were deposited by the pack cementation method onto Crofer 22 APU ferritic stainless steel. Isothermal and cyclic oxidation was carried out to evaluate the role of coating materials during oxidation. Area-specific resistance (ASR) of the Mn-Co-coated substrates was also tested at 800°C. The results demonstrate that the coating layer transforms to MnCo 2 O 4 , CoFe 2 O 4 , CoCr 2 O 4 , and Co 3 O 4 spinels during oxidation. This scale is protective, and acts as an effective barrier against chromium migration into the outer oxide. Mn-Co oxide and cobalt oxides also cause a reduction in ASR, in comparison to that of bare steel.

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Section: Microstructure and Composition Of Isothermal Oxidized Coatingcontrasting

confidence: 82%

Oxidation and Electrical Behavior of Mn-Co-Coated Crofer 22 APU Steel Produced by a Pack Cementation Method for SOFC Interconnect Applications

Ebrahimifar

Zandrahimi

2015

Oxid Met

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“…In both cases, the square of the weight gain per unit area (ΔW/A) 2 increases linearly with the increase in the isothermal oxidation time. This confirms that (ΔW/A) 2 as a function of oxidation time satisfies the parabolic kinetics law described by the following equation:

{(\frac{Δ W}{A})}^{2} = k_{p} t

…”

Section: Resultssupporting

confidence: 80%

“…Efforts have been made by various groups to demonstrate that a (Mn,Co) 3 O 4 spinel could be a promising barrier for interconnect applications in SOFCs. For example, Yang et al .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Mn–Co Spinel Coatings on Crofer 22 APU Stainless Steel by Electrophoretic Deposition for Interconnect Applications in Solid Oxide Fuel Cells

Zhang

Javed

Zhou

et al. 2013

Int J Applied Ceramic Tech

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This study investigates the microstructure, oxidation kinetics, and electrical behavior of Mn–Co spinel coating for interconnect applications in solid oxide fuel cells. A relatively dense, uniform, and well‐adherent Mn–Co (Mn1.5Co1.5O4) spinel coating with good oxidation resistance and stable conductivity was successfully prepared on the surface of Crofer 22 APU stainless steel using electrophoretic deposition followed by sintering at 1150°C. During further thermal treatment at 800°C, the chromium oxide (Cr2O3) sublayer formed at the substrate/coating interface during sintering showed a very slow growth, and no chromium penetration was detected in the Mn–Co coating. The oxidation kinetics of the Mn–Co‐coated substrate obeyed the parabolic law with the a parabolic rate constant kp of 5.20 × 10−15 g2/cm4/s, which was 1–2 orders of magnitude lower than that of the uncoated Crofer 22 APU stainless steel substrate. For oxidation (at 800°C) times ≥50 h, the area‐specific resistance of the Mn–Co‐coated Crofer 22 APU substrate became ~17 mΩ·cm2 and was almost constant after further oxidation.

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“…(9), Chen et al estimated the conductivity of SrCrO 4 in air at 1,073 K as 3.8 9 10 -4 S cm -1 [37], which is lower than that of Cr 2 O 3 (ca. 10 -2 S cm -1 ) [38].…”

Section: Calculation Of Mass Change During Cyclic Oxidationmentioning

confidence: 99%

Oxidation properties of the Crofer 22 APU steel coated with La0.6Sr0.4Co0.2Fe0.8O3 for IT-SOFC interconnect applications

Przybylski

Brylewski

Durda

et al. 2014

J Therm Anal Calorim

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The La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (LSCF48) cathode material was used as a protective-conducting coating on an interconnect made of Crofer 22 APU ferritic steel intended for application in intermediate-temperature solid oxide fuel cell (IT-SOFC) stacks. The LSCF48 coating was deposited on the surface of the steel via screen-printing followed by appropriate thermal treatment. The oxidation kinetics of the Crofer 22 APU steel-uncoated and coated with LSCF48-approximately obeys the parabolic rate law in air at 1,073 K under isothermal and cyclic oxidation conditions. The oxidation rate for uncoated steel is higher than that for coated steel. SEM-EDS and XRD investigations showed that the LSCF48 coating interacts with the steel during long-term oxidation in the afore-mentioned thermal conditions, and an intermediate multilayer interfacial zone is formed. This intermediate layer leads to lower area specific resistance in air at 1,073 K in comparison to the Crofer 22 APU steel without surface modification.

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Strontium transport and conductivity of Mn1.5Co1.5O4 coated Haynes 230 and Crofer 22 APU under simulated solid oxide fuel cell condition

Cited by 17 publications

References 28 publications

Oxidation and Electrical Behavior of Mn-Co-Coated Crofer 22 APU Steel Produced by a Pack Cementation Method for SOFC Interconnect Applications

Oxidation and Electrical Behavior of Mn-Co-Coated Crofer 22 APU Steel Produced by a Pack Cementation Method for SOFC Interconnect Applications

Fabrication of Mn–Co Spinel Coatings on Crofer 22 APU Stainless Steel by Electrophoretic Deposition for Interconnect Applications in Solid Oxide Fuel Cells

Oxidation properties of the Crofer 22 APU steel coated with La0.6Sr0.4Co0.2Fe0.8O3 for IT-SOFC interconnect applications

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