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In Situ Foaming of Porous ( L a 0.6 S r 0.4 ) 0.98 ( C o 0.2 F e 0.8 ) O 3−δ ( LSCF ) Cathodes for Solid Oxide Fuel Cell Applications
Author(s) -
Gandavarapu Sodith,
Sabolsky Edward,
Sabolsky Katarzyna,
Gerdes Kirk
Publication year - 2013
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12142
Subject(s) - materials science , microstructure , porosity , chemical engineering , cathode , electrochemistry , polyurethane , polymer , pulmonary surfactant , foaming agent , dielectric spectroscopy , isocyanate , composite material , electrode , chemistry , engineering
A binder system containing polyurethane precursors was used to in situ foam (direct foam) a ( L a 0.6 S r 0.4 ) 0.98 ( C o 0.2 F e 0.8 ) O 3−δ ( LSCF ) composition for solid oxide fuel cell ( SOFC ) cathode applications. The relation between in situ foaming parameters on the final microstructure and electrochemical properties was characterized by microscopy and electrochemical impedance spectroscopy ( EIS ), respectively. The optimal porous cathode architecture was formed with a 70 vol% solids loading within a polymer precursor composition with a volume ratio of 8:4:1 (isocyanate: PEG : surfactant) in a terpineol‐based ink vehicle. The resultant microstructure displayed a broad pore size distribution with highly elongated pore structure.