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Ceria (La 3+ , Sr 2+ )/Carbonates Nanocomposite Electrolytes with High Electrical Conductivity for Low‐Temperature SOFC s
Author(s) -
Jaiswal Nandini,
Kumar Devendra,
Parkash Om,
Upadhyay Shail
Publication year - 2014
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.12327
Subject(s) - materials science , analytical chemistry (journal) , nanocomposite , eutectic system , ionic conductivity , electrical resistivity and conductivity , fast ion conductor , scanning electron microscope , dielectric spectroscopy , strontium , lanthanum , thermal expansion , activation energy , electrolyte , conductivity , differential thermal analysis , mineralogy , inorganic chemistry , diffraction , microstructure , nanotechnology , electrochemistry , chemistry , metallurgy , composite material , electrode , engineering , chromatography , electrical engineering , physics , organic chemistry , optics
A series of ceria‐based nanocomposites consisting of lanthanum and strontium codoped ceria with composition Ce 0.89 La 0.07 Sr 0.04 O 1.925 (CL7S4) and eutectic mixture of carbonates Li 2 CO 3 ‐Na 2 CO 3 (LNCO) have been prepared by mixing nanosize powders of CL7S4 and LNCO. Samples have been characterized using differential thermal analysis, X‐ray diffraction, scanning electron microscopy combined with energy‐dispersive spectroscopy, thermal expansion, and impedance spectroscopy. A sharp increase in ionic conductivity is observed in all the composite specimens corresponding to superionic transition. Sample containing 35 wt% of carbonate shows the maximum conductivity (2.56 × 10 −1 S/cm at 500°C) with activation energy of conduction, E a 0.23 eV.