PRESTAT, Michel; MORANDI, Anne; HEEL, Andre; HOLZER, Lorenz; HOTAPPELS, P.; GRAULE, Thomas

doi:10.1016/j.elecom.2009.12.018

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PRESTAT, Michel
Eidgenössische Materialprüfanstalt EMPA

MORANDI, Anne
Eidgenössische Materialprüfanstalt EMPA
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

HEEL, Andre
Eidgenössische Materialprüfanstalt EMPA

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Electrochemistry Communications. 2010, vol. 12, n° 2, p. 292-295

Elsevier

Résumé en anglais

This study aimed at fabricating porous crack-free and delamination-free La0.6Sr0.4CoO3−δ electrodes using nanopowders and investigating oxygen reduction (occurring at solid oxide fuel cell cathodes) and oxygen evolution (occurring at solid oxide electrolysis cell anodes) at 600 °C in air. The electrodes were deposited by screen-printing on Ce0.8Gd0.2O1.9 substrates. The pastes were prepared with nanoparticles synthesised by flame spray synthesis and graphite pore former. Without graphite, the electrodes sintered at 1000 °C exhibit relatively low porosity and significant densification which led to partial delamination and large overpotentials. The addition of graphite, which was removed by combustion at ca. 650 °C during sintering, markedly improves electrode performance by increasing porosity and reducing densification. A minimal overpotential for both the oxygen reduction and oxygen evolution was reached for a layer porosity of ca. 50–60 vol.%.< Réduire

Mots clés en anglais

Nanoparticles

Pore former

Microstructure

Mixed ionic-electronic conductors

Oxygen reduction

Oxygen evolution

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Effect of graphite pore former on oxygen electrodes prepared with La<sub>0.6</sub>Sr<sub>0.4</sub>CoO<sub>3−</sub><i><sub>δ</sub></i> nanoparticles

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