AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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STUDIA AMBIENTUM - Issue no. 1-2 / 2015 | |||||||
Article: |
CERIA-CARBONATE SOLID ELECTROLYTE COMPOZITE FOR INTERMEDIATE TEMPERATURE FUEL CELL. Authors: ADRIANA BALINT (SAMOILA), TANIA RISTOIU, AMALIA MESAROS, MIRCEA NASUI, RAMONA MOS, MIHAI GABOR, VASILE BOGDAN, TRAIAN PETRISOR JR., LELIA CIONTEA. |
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Abstract: Ceria based nanocomposites consisting of calcium doped
ceria and Na2CO3
have been prepared for their use as solid state electrolyte in solid
oxide fuel cells by a direct co-precipitation method followed by a thermal treatment at 700 0C. The
decomposition course of the precursor, the thermal stability, the
morphology, and the composite formation succession were studied by
thermogravimetric analyses (TG), FT-IR
spectroscopy, SEM and XRD analyses. The only identified crystalline
phase is cerium oxide, in which the cerium ions are partially substituted by
the calcium ions. The absence of any carbonate phase in the XRD pattern is indicative for its amorphous character. The
calcium doped ceria crystallites, with an average size of about 50 nm,
have a uniform distribution in the matrix.
The temperature dependence of the conductivity between 300-600 0C
was performed on the composite pellets,
exhibiting an exponential behavior of the electrical conductivity with
values intermediate between the calcium doped ceria and Na2CO3.
The activation energy decreases from 1.693 eV for pure ceria to 0.79 eV for the
calcium doped ceria nanocomposite. Key words: ceria, co-precipitation, electrical conductivity,
SOFC |
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