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
MORANDI, Anne
Eidgenössische Materialprüfanstalt EMPA
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
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Eidgenössische Materialprüfanstalt EMPA
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
MORANDI, Anne
Eidgenössische Materialprüfanstalt EMPA
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
< Reduce
Eidgenössische Materialprüfanstalt EMPA
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Language
en
Article de revue
This item was published in
Electrochemistry Communications. 2010, vol. 12, n° 2, p. 292-295
Elsevier
English Abstract
This study aimed at fabricating porous crack-free and delamination-free La<sub>0.6</sub>Sr<sub>0.4</sub>CoO<sub>3−</sub><i><sub>δ</sub></i> electrodes using nanopowders and investigating oxygen reduction (occurring at solid ...Read more >
This study aimed at fabricating porous crack-free and delamination-free La<sub>0.6</sub>Sr<sub>0.4</sub>CoO<sub>3−</sub><i><sub>δ</sub></i> 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 Ce<sub>0.8</sub>Gd<sub>0.2</sub>O<sub>1.9</sub> 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.%.Read less <
English Keywords
Nanoparticles
Pore former
Microstructure
Mixed ionic-electronic conductors
Oxygen reduction
Oxygen evolution
Origin
Hal imported