Chromium Poisoning of LSM Cathodes - Results from Stack Testing

Menzler, Norbert H.; Vinke, Izaak C.; Lippert, H.

doi:10.1149/1.3205855

Cited by 23 publications

(16 citation statements)

References 3 publications

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“…It may therefore be argued that the oxidation rate of Crofer 22 APU at 700 °C is sufficiently low that further reduction by a protective coating is not needed. Nevertheless, to prevent Cr poisoning of the oxygen electrode a protective coating will still be necessary [42,43].…”

Section: Oxidation Kineticsmentioning

confidence: 99%

Comparison of iron and copper doped manganese cobalt spinel oxides as protective coatings for solid oxide fuel cell interconnects

Talic

Molin

Wiik

et al. 2017

Journal of Power Sources

101

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Section: Oxidation Kineticsmentioning

confidence: 99%

Comparison of iron and copper doped manganese cobalt spinel oxides as protective coatings for solid oxide fuel cell interconnects

Talic

Molin

Wiik

et al. 2017

Journal of Power Sources

101

View full text Add to dashboard Cite

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“…The Cr content of 22 wt.% ensures the formation of protective Cr base surface scales. However, during SOFC operation the formation of volatile Cr oxides and especially oxyhydroxides may deteriorate the cathode and/or the cathode/electrolyte interface . Therefore, various coating types are being used to minimize the formation of volatile Cr species , ; in JÜLICH's standard F10 design an atmospheric plasma sprayed (APS) coating of MCF is being applied .…”

Section: Introductionmentioning

confidence: 99%

Post‐test Characterization of Metallic Materials and Adjacent Components in an SOFC Stack After 34,000 h Operation at 700 °C

et al. 2018

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The present paper describes the electrochemical results and the post exposure microstructural characterization by means of SEM/EDS of a four layer SOFC stack after 34,000 h operation under load at 700 °C, showing low voltage degradation rate less than 0.3% per 1,000 h. Emphasis was put on the behavior of the ferritic interconnect steel and its interaction with glass sealants as well as contacting and coating materials. The interconnect steel had formed thin protective chromia scales. Gas distributing steel foils of 200 µm showed in some locations breakaway type oxidation. It was related to local overheating caused by locally occurring combustion of a defective cell. The interaction of the steel with the glass sealant showed good adhesion. Interdiffusion at the joint between nickel contact and steel interconnect at the anode side resulted in minor oxide formation on the Ni wires and in austenite formation in the steel without formation of σ‐FeCr formation at the steel/austenite interface. The steel showed excellent compatibility with the Manganese‐Cobalt‐Ferrite (MCF) chromium retention coatings. Chromium enriched phases were found near the interface between MCF coating and perovskite contact layer. Excess glass sealing material interacted with the contact layer without showing obvious detrimental effects.

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“…1). Subsequently, specific parts of the embedded part were also water jet cut, as described previously (4), for scanning electron microscopy (SEM) and X-ray diffraction (XRD).…”

Section: Introductionmentioning

confidence: 99%

Post-Test Characterization of an SOFC Short-Stack after 17,000 Hours of Steady Operation

et al. 2011

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A typical F-design SOFC short stack of Forschungszentrum Jülich was metallographically analyzed after long-term steady-state operation for 17,000 h at 700°C and 0.5 A/cm². After scheduled shut down, the stack was partly embedded in resin and subsequently various stack parts were cut from multiple places of interest. All important components (cell, metal parts, sealant, and contact layers) were characterized with respect to microstructural and chemical changes and interactions with the adjacent components. Surprisingly, the post-test characterization revealed less changes and interactions than expected. One clear feature that could be observed was the interaction between the (La,Sr)(Co,Fe)O 3 cathode and volatile chromium species. Another finding was spot-like corrosion in the metallic parts, but this did not cause severe damage. It can be concluded that by tailoring the component materials and the operational conditions, long-term operation of this type of SOFC stacks is possible.

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Chromium Poisoning of LSM Cathodes - Results from Stack Testing

Cited by 23 publications

References 3 publications

Comparison of iron and copper doped manganese cobalt spinel oxides as protective coatings for solid oxide fuel cell interconnects

Comparison of iron and copper doped manganese cobalt spinel oxides as protective coatings for solid oxide fuel cell interconnects

Post‐test Characterization of Metallic Materials and Adjacent Components in an SOFC Stack After 34,000 h Operation at 700 °C

Post-Test Characterization of an SOFC Short-Stack after 17,000 Hours of Steady Operation

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