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Mezzolombardo, Italy

Diethelm S.,Ecole Polytechnique Federale de Lausanne | Herle J.V.,Ecole Polytechnique Federale de Lausanne | Montinaro D.,SOFCpower Spa | Bucheli O.,HTceramix SA
Fuel Cells | Year: 2013

In this study, two short SOE stacks (6-cells) were characterized in steam-electrolysis mode. The first was based on Ni-YSZ supported cells with LSCF-based air electrodes. The second included LSC-based air electrodes specifically developed within the SOFC600 project. The stacks were fed with a 90% steam, 10% hydrogen mixture, and characterized between 600 and 700°C. For the LSCF-based stack, an average cell voltage of 1.6 V was reached at -1 A cm-2 and 700°C, corresponding to 60% steam conversion. The LSC-based stack showed better performances, with 1.25 V at -0.8 A cm -2 and 700°C. Durability tests were performed around the thermoneutral voltage (1.35 V) for resp. 2,400 (LSCF) and 1,500 h (LSC). The average stack degradation rates were resp. +2.8% (kh)-1 (LSCF) and +1.9% (kh)-1 (LSC). Twelve load-cycles were also performed on the LSC-stack with no apparent degradation. In addition, co-electrolysis was performed between 750 and 850°C by feeding the stack with a 60% H 2O, 30% CO2, and 10% H2 mixture. Ninety-five percent conversion was reached and the measured outlet syngas composition was close to that predicted by thermodynamics. Steam electrolysis tests were carried out in the same conditions for comparison. The stack performance in the co-electrolysis mode was slightly lower than in the electrolysis mode. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Satardekar P.,University of Trento | Sglavo V.M.,University of Trento | Montinaro D.,SOFCpower Spa
International Journal of Applied Ceramic Technology | Year: 2015

The effect of Al doping on Ni-YSZ anode sintering in metal-supported solid oxide fuel cell (MS-SOFC) was studied in the current work.The electrical conductivity of the Al-doped anode was found to increase considerably. Such result may be attributed to the inhibited sintering of insulating YSZ caused by the segragation of Al2O3 at grain boundaries. It was found that the addition of Al to the anode accounts for a finer grained YSZ matrix, thus coating the conducting Ni grains to a lesser extent. 5 wt% Al-doped NiO used for Ni-YSZ anode material gave the finest microstucture and the highest electrical conductivity at room temperature although it showed the lowest bulk density. Overall, Al-doped Ni-YSZ anode material was found to be a suitable material for the anode in MS-SOFC produced by cosintering. © 2014 The American Ceramic Society. Source

Cologna M.,University of Trento | Sglavo V.M.,University of Trento | Bertoldi M.,SOFCpower Spa
International Journal of Applied Ceramic Technology | Year: 2010

Anode-supported solid oxide fuel cells have been produced by water base sequential tape casting and cosintering. The curvature developed upon cosintering was monitored in situ. By tailoring the green microstructure, it was possible to reduce the curvature rate and to produce flat cells avoiding the need for a creep-flattening treatment. The power density at 800°C and 0.7 V was 751.7 mW/cm2. © 2009 The American Ceramic Society. Source

Francis J.S.C.,University of Colorado at Boulder | Cologna M.,University of Colorado at Boulder | Montinaro D.,SOFCpower Spa | Raj R.,University of Colorado at Boulder
Journal of the American Ceramic Society | Year: 2013

We show that multilayer green tapes constituted from sandwiched layers of NiO-zirconia anode and cubic zirconia electrolyte can be sintered below 1000°C in a few seconds under the influence of a DC electric field. The sintering yields a dense electrolyte layer with minor closed porosity, and an anode layer with open porosity, and, most importantly, a multilayer that is largely devoid of defects and delamination. © 2013 The American Ceramic Society. Source

Satardekar P.,University of Trento | Montinaro D.,SOFCpower Spa | Sglavo V.M.,University of Trento
Ceramics International | Year: 2015

Abstract Considering Fe as sintering aid for Yttria Stabilized Zirconia (YSZ), studies have been conducted under conditions necessary for the fabrication of MS-SOFC by co-sintering. Pure and Fe doped YSZ was sintered at 1350°C in air and in argon atmosphere and a comparative study has been performed. Structural characterizations were carried out using X-ray diffraction (XRD) techniques, while ionic conductivity was measured in air using four-probe impedance spectroscopy. It is found that Fe enhances the sintering rate of YSZ in both air and argon atmosphere. All samples sintered in argon atmosphere are characterized by better 'sinterability', larger lattice parameter, higher density, larger grain size and lower conductivity, as compared to samples sintered in air. Ionic conductivity is found to decrease with increase in Fe concentration for all sintered samples. © 2015 Elsevier Ltd and Techna Group S.r.l. Source

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