Coated stainless steel 441 as interconnect material for solid oxide fuel cells: Oxidation performance and chromium evaporation

Grolig, Jan Gustav; Froitzheim, Jan; Svensson, Jan‐Erik

doi:10.1016/j.jpowsour.2013.08.089

Cited by 108 publications

(80 citation statements)

References 24 publications

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“…This assumption is also in accordance with the model of electrode reaction described for SSC point electrodes by Baumann et al [38] and Grolig et al [39]. According to these authors R 5 represents resistance connected to the surface oxygen exchange reaction and C 5 chemical capacitance related to oxygen stoichiometry changes in the bulk of the electrode.…”

Section: Electrochemical Impedance Spectroscopysupporting

confidence: 84%

Thermal shock resistant composite cathode material Sm0.5Sr0.5CoO3–δ–La0.6Sr0.4FeO3–δ for solid oxide fuel cells

Tatko

Mosiałek

Kędra

et al. 2015

J Solid State Electrochem

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The Sm 0.5 Sr 0.5 CoO 3-δ -La 0.6 Sr 0.4 FeO 3-δ 1:1 composite, obtained by sintering mixture of components, was tested as a prospective cathode material for the oxygen reduction reaction in solid oxide fuel cells. Catalytic activity of the prepared material was characterized using electrochemical impedance spectroscopy at 400, 450, 500, 550, 600, 650, and 700°C in oxygen and oxygen-argon mixtures in half-cells with Sm 0.2 Ce 0.8 O 1.9 as the electrolyte. Relatively low activation energies (65.2, 66.9, and 56.3 kJ mol −1 for P O2 /P = 1.0, 0.1, and 0.01, respectively) for the reaction polarization resistance were observed. The specific surface area and the pore distribution were measured by N 2 adsorption method. The non-localized density functional theory was used in the analysis of the porosity data. The activity of the prepared composite depended on the pore structure which, in turns, depends on the sintering temperature. The best results were obtained for the composite sintered at the temperature of 1000°C, where significant decrease in porosity is observed. The series of 53 thermal cycles, consisting of heating to 750°C and cooling to room temperature confirmed the stability of the composite.

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Section: Electrochemical Impedance Spectroscopysupporting

confidence: 84%

Thermal shock resistant composite cathode material Sm0.5Sr0.5CoO3–δ–La0.6Sr0.4FeO3–δ for solid oxide fuel cells

Tatko

Mosiałek

Kędra

et al. 2015

J Solid State Electrochem

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“…A compilation of coatings for interconnects can be found in our previous study on improving corrosion properties and mitigating chromium evaporation of AISI 441 by the use of nanometer thick coatings. There it was found that both lifetime and chromium evaporation could be significantly improved by the application of an additional coating of cerium and cobalt [1]. However no data on the ASR evolution was reported, but will be presented in this work.…”

Section: Introductionmentioning

confidence: 93%

“…Details on the exposure setup can be found in Ref. [1]. Samples were exposed both isothermally (no cool-down until the end of the exposure) and discontinuous (several interruptions with weighing in-between) for up to 1500 h.…”

Section: Exposurementioning

confidence: 99%

Coated stainless steel 441 as interconnect material for solid oxide fuel cells: Evolution of electrical properties

Grolig

Froitzheim

Svensson

2015

Journal of Power Sources

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h i g h l i g h t sWe exposed cerium/cobalt coated AISI 441 in a SOFC cathode side atmosphere. We tested two different methods of ASR measurement. In-situ measured samples were heavily affected by platinum electrodes. ASR values of ex-situ measured samples could be related to oxidation. The oxidation and chromium volatilization were monitored. a b s t r a c t AISI 441 coated with a double layer coating of 10 nm cerium (inner layer) and 630 nm cobalt was investigated and in addition the uncoated material was exposed for comparison. The main purpose of this investigation was the development of a suitable ASR characterization method. The material was exposed to a simulated cathode atmosphere of air with 3% water at 850 C and the samples were exposed for up to 1500 h. We compared two methods of ASR measurements, an in-situ method where samples were measured with platinum electrodes for longer exposure times and an ex-situ method where preoxidized samples were measured for only very short measurement times. It was found that the ASR of ex-situ characterized samples could be linked to the mass gain and the electrical properties could be linked to the evolving microstructure during the different stages of exposure. Both the degradation of the electric performance and the oxygen uptake (mass gain) followed similar trends. After about 1500 h of exposure an ASR value of about 15 mUcm 2 was reached. The in-situ measured samples suffered from severe corrosion attack during measurement. After only 500 h of exposure already a value of 35 mUcm 2 was obtained.

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“…The performance loss is attributed to corrosion in oxygen atmosphere particularly at cathode side of the interconnect surface. The produced oxide scale and poisoning of cathode catalyst layer by chromium evaporation may be considered as reasons for performance degradation as pointed out by several researchers [15]. The performance of the short stack where interconnect surface is coated with Mn 1.5 Co 1.5 O 4 and heat treated only in air atmosphere is shown in Fig.…”

Section: Resultsmentioning

confidence: 93%

Application of a coating mixture for solid oxide fuel cell interconnects

Ünal

Mat

Demir

et al. 2015

International Journal of Hydrogen Energy

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Coated stainless steel 441 as interconnect material for solid oxide fuel cells: Oxidation performance and chromium evaporation

Cited by 108 publications

References 24 publications

Thermal shock resistant composite cathode material Sm0.5Sr0.5CoO3–δ–La0.6Sr0.4FeO3–δ for solid oxide fuel cells

Thermal shock resistant composite cathode material Sm0.5Sr0.5CoO3–δ–La0.6Sr0.4FeO3–δ for solid oxide fuel cells

Coated stainless steel 441 as interconnect material for solid oxide fuel cells: Evolution of electrical properties

Application of a coating mixture for solid oxide fuel cell interconnects

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