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HYSYDAYS<br>1st World Congress of Young Scientists on Hydrogen Energy Systems

ISBN:
1-56700-230-7 (Print)

SOLID OXIDE FUEL CELLS FABRICATION BY TAPE CASTING OF WATER BASED SUSPENSIONS

Dario Montinaro
DIMTI, Università degli Studi di Trento Via Mesiano 77 38050 Trento, Italy

Vincenzo M. Sglavo
DIMTI, Università degli Studi di Trento Via Mesiano 77 38050 Trento, Italy

Massimo Bertoldi
Eurocoating SpA Via Al Dos de la Roda 60 38057 Pergine Valsugana (TN), Italy

Thomas Zandonella
Eurocoating SpA Via Al Dos de la Roda 60 38057Pergine Valsugana (TN), Italy

Stefano Modena
ITC-IRST Via Sommarive 18 38050 Povo (TN), Italy

Sergio Ceschini
ITC-IRST Via Sommarive 18 38050 Povo (TN), Italy

Andrea Tomasi
ITC-IRST Via Sommarive 18 38050 Povo (TN), Italy

Abstract

Solid Oxide Fuel Cells (SOFCs) are promising electrochemical devices which directly produce electrical energy by electrochemical combination of a fuel gas with an oxidant. The most attractive features of these converters are their high conversion efficiency and the possibility to process a wide variety of fuel gases due to the high operating temperatures.
SOFCs electrode materials were produced by tape casting starting from water-based suspensions in order to propose an easy, environmental friendly and health safe technology. Ceramic slurries were prepared using commercial oxide powders and casted by a laboratory scale tape caster. Green anode and electrolyte tapes were stacked together, warm-pressed and sintered at 1400°C to obtain planar half-cells in the anode supported configuration. By this method half cells with electrolyte thickness of the order of 5 µm are successfully prepared. In spite of the thermal expansion coefficient mismatch between anode and electrolyte materials, micro-structural analysis showed a perfect contact interface between co-sintered elements and delamination was not observed.
In order to improve the electrolyte/cathode interface, a YSZ porous layer was introduced in the green laminate and the sintered porous electrolyte was impregnated by a Pechini type gel precursor. Cells were then calcinated to allow perovskite formation. LSM20 current collector was then screen printed on the electrolyte/cathode interface. The electro-chemical performance of cells was studied by OCV measurements and polarization analysis in the temperature range between 750 and 900°C.