Enhanced chromium tolerance of La0.6Sr0.4Co0.2Fe0.8O3−δ electrode of solid oxide fuel cells by Gd0.1Ce0.9O1.95 impregnation

Zhao, Ling; Amarasinghe, Sudath; Jiang, San Ping

doi:10.1016/j.elecom.2013.10.019

Cited by 57 publications

(27 citation statements)

References 15 publications

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“…Surface modification may be used for reasons other than promoting catalytic activity or adding conduction pathways. It was shown that by impregnating 30 wt.% of CGO into LSCF oxygen-electrodes, chromium poisoning from a typical metallic interconnect was greatly reduced, showing that the technique can be used to add chemical protection from contaminants as well 74 .…”

Section: Impregnationmentioning

confidence: 99%

Evolution of the electrochemical interface in high-temperature fuel cells and electrolysers

et al. 2016

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Section: Impregnationmentioning

confidence: 99%

Evolution of the electrochemical interface in high-temperature fuel cells and electrolysers

et al. 2016

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“…Furthermore, the oxide scale in reaction with oxygen and water vapor forms volatile Cr(VI)species that have been reported to "poison" the SOFC cathode [5,6]. There have been some attempts to develop new cathode materials with higher Cr tolerance [7][8][9]. However, this does not eliminate the problem of high Cr evaporation rates as Cr depletion from the alloy below a certain limit may lead to break-away type oxidation [10,11].…”

Section: Introductionmentioning

confidence: 99%

Effect of coating density on oxidation resistance and Cr vaporization from solid oxide fuel cell interconnects

Talic¹,

Falk-Windisch

Venkatachalam³

et al. 2017

Journal of Power Sources

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Manganese cobalt spinel oxides are promising materials for protective coatings for solid oxide fuel cell (SOFC) interconnects. To achieve high density such coatings are often sintered in a two-step procedure, involving heat treatment first in reducing and then in oxidizing atmospheres. Sintering the coating inside the SOFC stack during heating would reduce production costs, but may 2 result in a lower coating density. The importance of coating density is here assessed by characterization of the oxidation kinetics and Cr evaporation of Crofer 22 APU with MnCo 1.7 Fe 0.3 O 4 spinel coatings of different density. The coating density is shown to have minor influence on the longterm oxidation behavior in air at 800 °C, evaluated over 5000 h. Sintering the spinel coating in air at 900 °C, equivalent to an in-situ heat treatment, leads to an 88 % reduction of the Cr evaporation rate of Crofer 22 APU in air-3% H 2 O at 800 °C. The air sintered spinel coating is initially highly porous, however, densifies with time in interaction with the alloy. A two-step reduction and re-oxidation heat treatment results in a denser coating, which reduces Cr evaporation by 97 %.

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“…Another approach to increasing the density of reaction sites, particularly triple-phase boundaries (TPBs), is the introduction of metal or ceramic nanoparticles into an as-prepared porous structure by wet infiltration [21][22][23][24][25][26][27][28][29][30]. Typically, the wet infiltration technique entails the introduction and thermal decomposition of a metal or ceramic precursor solution in the porous structure.…”

mentioning

confidence: 99%

Improvement in the Electrochemical Performance of Anode‐supported Solid Oxide Fuel Cells by Meso‐ and Nanoscale Structural Modifications

et al. 2020

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To improve the electrochemical performance of anode-supported solid oxide fuel cells (SOFCs), microextrusion printing and wet infiltration techniques are employed for structural modification on the meso-(10-100 mm) and nanoscale order, respectively. In the mesoscale structural modification, anode ridge structures are fabricated by extruding an anode slurry on the surface of a flat anode disk to extend the electrodeelectrolyte interfacial area. In the nanoscale structural modification, gadolinium-doped ceria (GDC) nanoparticles are introduced into a porous lanthanum strontium cobalt ferrite (LSCF) cathode. To investigate the effects of mesoscale and nanoscale structural modifications, four different types of anode-supported SOFC including a conventional cell are prepared , and their performance is evaluated at several operating temperatures. It is found that both the mesoscale and nanoscale structural modifications reduce not only the polarization resistance but also the ohmic resistance in the cells, resulting in the improvement in cell performance. Moreover, it is clarified that the improvement in cell performance becomes greater with decreasing operating temperature. Specifically, the maximum power density in the cell where both mesoscale and nanoscale structural modifications are applied is increased by 66% at 600°C and 34% at 700°C, compared with that in the conventional cell.

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Enhanced chromium tolerance of La0.6Sr0.4Co0.2Fe0.8O3−δ electrode of solid oxide fuel cells by Gd0.1Ce0.9O1.95 impregnation

Cited by 57 publications

References 15 publications

Evolution of the electrochemical interface in high-temperature fuel cells and electrolysers

Evolution of the electrochemical interface in high-temperature fuel cells and electrolysers

Effect of coating density on oxidation resistance and Cr vaporization from solid oxide fuel cell interconnects

Improvement in the Electrochemical Performance of Anode‐supported Solid Oxide Fuel Cells by Meso‐ and Nanoscale Structural Modifications

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