An Investigation of LSF-YSZ Conductive Scaffolds for Infiltrated SOFC Cathodes

Cheng, Yuan; Oh, Tae-Sik; Wilson, Rachel; Gorte, Raymond J.; Vohs, John M.

doi:10.1149/2.0531706jes

Title: An Investigation of LSF-YSZ Conductive Scaffolds for Infiltrated SOFC Cathodes

Journal Article · Fri Mar 24 00:00:00 EDT 2017 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/2.0531706jes· OSTI ID:1427990

^[1]; Oh, Tae-Sik ^[2]; Wilson, Rachel ^[1]; Gorte, Raymond J. ^[1]; Vohs, John M. ^[1]

Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Chemical and Biomolecular Engineering
Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Chemical and Biomolecular Engineering; Auburn Univ., AL (United States). Dept. of Chemical Engineering

Porous composites of Sr-doped LaFeO₃ (LSF) and yttria-stabilized zirconia (YSZ) were investigated as conductive scaffolds for infiltrated SOFC cathodes with the goal of producing scaffolds for which only a few perovskite infiltration steps are required to achieve sufficient conductivity. While no new phases form when LSF-YSZ composites are calcined to 1623 K, shifts in the lattice parameters indicate Zr can enter the perovskite phase. Measurements on dense, LSF-YSZ composites show that the level of Zr doping depends on the Sr:La ratio. Because conductivity of undoped LSF increases with Sr content while both the ionic and electronic conductivities of Zr-doped LSF decrease with the level of Zr in the perovskite phase, there is an optimum initial Sr content corresponding to La_0.9Sr_0.1FeO₃ (LSF91). Although scaffolds made with 100% LSF had a higher conductivity than scaffolds made with 50:50 LSF-YSZ mixtures, the 50:50 mixture provides the optimal interfacial structure with the electrolyte and sufficient conductivity, providing the best cathode performance upon infiltration of La_0.6Sr_0.4Co_0.2Fe_0.8O₃ (LSCF).

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Research Organization:: Univ. of Pennsylvania, Philadelphia, PA (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: FE0023317

OSTI ID:: 1427990

Journal Information:: Journal of the Electrochemical Society, Vol. 164, Issue 6; ISSN 0013-4651

Publisher:: The Electrochemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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Materials and nano-structural processes for use in solid oxide fuel cells: a review Jo, Seungyeon; Sharma, Bharat; Park, Dae-Hwan Journal of the Korean Ceramic Society, Vol. 57, Issue 2 https://doi.org/10.1007/s43207-020-00022-3	journal	January 2020

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
composite scaffold
fuel cell
infiltration
ionic conductivity
LSCF
LSF
membrane
SOFC
YSZ

Title: An Investigation of LSF-YSZ Conductive Scaffolds for Infiltrated SOFC Cathodes

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