The effect of precursor solution desiccation or nano-ceria pre-infiltration on various La0.6Sr0.4FeyCo1-yO3-x infiltrate compositions

Theodore E. Burye, Hongjie Tang, Jason D. Nicholas

Research output: Contribution to journalArticle

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Abstract

Here, electrochemical impedance spectroscopy, X-ray diffraction, and scanning electron microscopy were used to determine the effect of precursor solution desiccation and nano-ceria pre-infiltration on Solid Oxide Fuel Cell cathodes with various infiltrate compositions. The calcium chloride desiccation of citric acid containing La0.6Sr0.4FeO3-x (LSF), La0.6Sr0.4Fe0.8Co0.2O3-x (LSFC), La0.6Sr0.4Fe0.5Co0.5O3-x (LSCF55), La0.6Sr0.4Fe0.2Co0.8O3-x (LSCF), and La0.6Sr0.4CoO3-x (LSC) infiltrate precursor solutions reduced average infiltrate particle sizes from the ∼53 nm obtained with standard processing to ∼42 nm. Similarly, infiltration of the aforementioned La0.6Sr0.4FeyCo1-yO3-x precursor solutions into porous cathodes containing pre-infiltrated gadolinium doped ceria (GDC) particles reduced average La0.6Sr0.4FeyCo1-yO3-x infiltrate particle sizes from the ∼53 nm obtained with standard processing (i.e. in the absence of nano-GDC pre-infiltration) to ∼27 nm with nano-GDC pre-infiltration. These desiccation and nano-GDC pre-infiltration induced infiltrate particle size reductions resulted in improved cathode performance. For example, in comparison with the 650°C operating temperatures required for standard LSC-GDC cathodes to achieve a polarization resistance of 0.1Ωcm2, identical cathodes subjected to desiccation or nano-GDC pre-infiltration achieved 0.1Ωcm2 at 630°C and 570°C, respectively. These promising results suggest that precursor solution desiccation or nano-GDC pre-infiltration may be useful for reducing the sizes of a variety of SOFC infiltrate materials.

LanguageEnglish (US)
PagesF1017-F1022
JournalJournal of the Electrochemical Society
Volume163
Issue number9
DOIs
StatePublished - 2016

Profile

Cerium compounds
infiltration
gadolinium
Gadolinium
Infiltration
drying
Cathodes
Chemical analysis
cathodes
Particle size
Solid oxide fuel cells (SOFC)
cell cathodes
calcium chlorides
citric acid
Calcium Chloride
Calcium chloride
solid oxide fuel cells
operating temperature
Citric acid
Processing

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Cite this

The effect of precursor solution desiccation or nano-ceria pre-infiltration on various La0.6Sr0.4FeyCo1-yO3-x infiltrate compositions. / Burye, Theodore E.; Tang, Hongjie; Nicholas, Jason D.

In: Journal of the Electrochemical Society, Vol. 163, No. 9, 2016, p. F1017-F1022.

Research output: Contribution to journalArticle

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abstract = "Here, electrochemical impedance spectroscopy, X-ray diffraction, and scanning electron microscopy were used to determine the effect of precursor solution desiccation and nano-ceria pre-infiltration on Solid Oxide Fuel Cell cathodes with various infiltrate compositions. The calcium chloride desiccation of citric acid containing La0.6Sr0.4FeO3-x (LSF), La0.6Sr0.4Fe0.8Co0.2O3-x (LSFC), La0.6Sr0.4Fe0.5Co0.5O3-x (LSCF55), La0.6Sr0.4Fe0.2Co0.8O3-x (LSCF), and La0.6Sr0.4CoO3-x (LSC) infiltrate precursor solutions reduced average infiltrate particle sizes from the ∼53 nm obtained with standard processing to ∼42 nm. Similarly, infiltration of the aforementioned La0.6Sr0.4FeyCo1-yO3-x precursor solutions into porous cathodes containing pre-infiltrated gadolinium doped ceria (GDC) particles reduced average La0.6Sr0.4FeyCo1-yO3-x infiltrate particle sizes from the ∼53 nm obtained with standard processing (i.e. in the absence of nano-GDC pre-infiltration) to ∼27 nm with nano-GDC pre-infiltration. These desiccation and nano-GDC pre-infiltration induced infiltrate particle size reductions resulted in improved cathode performance. For example, in comparison with the 650°C operating temperatures required for standard LSC-GDC cathodes to achieve a polarization resistance of 0.1Ωcm2, identical cathodes subjected to desiccation or nano-GDC pre-infiltration achieved 0.1Ωcm2 at 630°C and 570°C, respectively. These promising results suggest that precursor solution desiccation or nano-GDC pre-infiltration may be useful for reducing the sizes of a variety of SOFC infiltrate materials.",
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AB - Here, electrochemical impedance spectroscopy, X-ray diffraction, and scanning electron microscopy were used to determine the effect of precursor solution desiccation and nano-ceria pre-infiltration on Solid Oxide Fuel Cell cathodes with various infiltrate compositions. The calcium chloride desiccation of citric acid containing La0.6Sr0.4FeO3-x (LSF), La0.6Sr0.4Fe0.8Co0.2O3-x (LSFC), La0.6Sr0.4Fe0.5Co0.5O3-x (LSCF55), La0.6Sr0.4Fe0.2Co0.8O3-x (LSCF), and La0.6Sr0.4CoO3-x (LSC) infiltrate precursor solutions reduced average infiltrate particle sizes from the ∼53 nm obtained with standard processing to ∼42 nm. Similarly, infiltration of the aforementioned La0.6Sr0.4FeyCo1-yO3-x precursor solutions into porous cathodes containing pre-infiltrated gadolinium doped ceria (GDC) particles reduced average La0.6Sr0.4FeyCo1-yO3-x infiltrate particle sizes from the ∼53 nm obtained with standard processing (i.e. in the absence of nano-GDC pre-infiltration) to ∼27 nm with nano-GDC pre-infiltration. These desiccation and nano-GDC pre-infiltration induced infiltrate particle size reductions resulted in improved cathode performance. For example, in comparison with the 650°C operating temperatures required for standard LSC-GDC cathodes to achieve a polarization resistance of 0.1Ωcm2, identical cathodes subjected to desiccation or nano-GDC pre-infiltration achieved 0.1Ωcm2 at 630°C and 570°C, respectively. These promising results suggest that precursor solution desiccation or nano-GDC pre-infiltration may be useful for reducing the sizes of a variety of SOFC infiltrate materials.

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