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en
Article de revue
Ce document a été publié dans
Journal of Solid State Chemistry. 2010, vol. 183, n° 3, p. 527-531
Elsevier
Résumé en anglais
Misfit-type Ca<sub>3−</sub><i><sub>x</sub></i>La<i><sub>x</sub></i>Co<sub>4</sub>O<sub>9+</sub><i><sub>δ</sub></i> (<i>x</i>=0, 0.3) oxides were synthesised to be evaluated as possible cathode materials for proton conducting ...Lire la suite >
Misfit-type Ca<sub>3−</sub><i><sub>x</sub></i>La<i><sub>x</sub></i>Co<sub>4</sub>O<sub>9+</sub><i><sub>δ</sub></i> (<i>x</i>=0, 0.3) oxides were synthesised to be evaluated as possible cathode materials for proton conducting fuel cells (PCFCs) based on BaCe<sub>0.9</sub>Y<sub>0.1</sub>O<sub>3−</sub><i><sub>δ</sub></i> (BCY10) dense ceramic electrolyte. The electrical conductivity value of Ca<sub>2.7</sub>La<sub>0.3</sub>Co<sub>4</sub>O<sub>9+</sub><i><sub>δ</sub></i> (<i>σ</i>≈53 S cm<sup>–1</sup> at 600 °C) is in the range of usually required value for a cathode application (about 50–100 S cm<sup>–1</sup>). In order to test the performance of each compound as cathode material, impedance measurements were carried out on Ca<sub>3−</sub><i><sub>x</sub></i>La<i><sub>x</sub></i>Co<sub>4</sub>O<sub>9+</sub><i><sub>δ</sub></i>/BaCe<sub>0.9</sub>Y<sub>0.1</sub>O<sub>3−</sub><i><sub>δ</sub></i>/Ca<sub>3−</sub><i><sub>x</sub></i>La<i><sub>x</sub></i>Co<sub>4</sub>O<sub>9+</sub><i><sub>δ</sub></i> symmetrical half cells over the temperature range 400–800 °C under wet air. A promising electrocatalytic activity has been observed with both compounds Ca<sub>3</sub>Co<sub>4</sub>O<sub>9+</sub><i><sub>δ</sub></i> and Ca<sub>2.7</sub>La<sub>0.3</sub>Co<sub>4</sub>O<sub>9+</sub><i><sub>δ</sub></i>. Factually, the area specific resistance obtained was about 2.2 Ω cm<sup>2</sup> at 600 °C.< Réduire
Mots clés en espagnol
Layered cobaltite oxide
Cathode
Proton conductor
PCFC
Y-doped BaCeO<sub>3</sub>
Origine
Importé de halUnités de recherche