|Title:||Effect of graphite pore former on oxygen electrodes prepared with La0.6Sr0.4CoO3−δ nanoparticles|
|Authors :||Prestat, Michel|
Graule, Thomas J.
|Published in :||Electrochemistry Communications|
|Publisher / Ed. Institution :||Elsevier Inc.|
|License (according to publishing contract) :||Licence according to publishing contract|
|Type of review:||Peer review (Publication)|
|Subject (DDC) :||540: Chemistry |
620.11: Engineering materials
|Abstract:||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.%.|
|Departement:||School of Engineering|
|Organisational Unit:||Institute of Computational Physics (ICP) |
Institute of Materials and Process Engineering (IMPE)
|Publication type:||Article in scientific Journal|
|Appears in Collections:||Publikationen School of Engineering|
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