For use of metal supported solid oxide fuel cell (MS-SOFC) in mobile applications it is important to reduce the thermal mass to enable fast startup, increase stack power density in terms of weight and volume and reduce costs. In the present study, we report on the effect of reducing the Technical University of Denmark (DTU) SoA MS-SOFCs support layer thickness from 313 μm gradually to 108 μm. The support layer thickness decrease in the DTU co-sintering MS-SOFC fabrication route results in an increased densification of the support layer and a slight decrease in performance. To mitigate the performance loss, two different routes for increasing the porosity of the support layer and thus performance were explored. The first route is the introduction of gas channels by puncturing of the green tape casted support layer. The second route is modification of the co-sintering profile. In summary, the cell thickness and thus weight and volume was reduced and the cell power density at 0.7 V at 700 • C was increased by 46% to 1.01 Wcm −2 at a fuel utilization of 48%. All modifications were performed on a stack technological relevant cell size of 12 cm × 12 cm. Solid oxide fuel cell (SOFC) is attractive due to the excellent power generation efficiency and fuel flexibility. The conventional ceramic electrolyte and anode supported SOFC (AS-SOFC) is limited to stationary power generation applications as a result of the difficulty of quick startup and the high operating temperatures of 700 to 1000 • C. If quick startup of a SOFC is realized, mobile applications may be considered. To enable this, it is important to shorten the startup time and reduce the heat cycle performance degradation and increase stack power density both in terms of weight and volume. As an approach to solving these problems, metal supported SOFCs (MS-SOFCs) have attracted attention. The development of this new generation of SOFC is currently in progress. DTU Energy's MS-SOFC technology is based on co-sintering of laminated tape casted electrolyte, anode and support layers in a reducing atmosphere. This implies that the sintering shrinkage of the different layers must be matched sufficiently so that the mechanical stresses originating from any mismatch in sintering shrinkage of the individual layers can be absorbed by the cell structure. If the cell structure is unable to absorb the mechanical stresses, the cell will crack. Perfect matching of sintering shrinkage of the layers is practically very difficult as e.g. the electrolyte layer needs to be completely dense and thus gastight, while the anode and support layers in contrast needs to be highly porous to allow sufficient gas transport.An overview and recent progress of MS-SOFCs have been reviewed in Ref. 1. The company Ceres Power founded in 2001 is at present the organization, which most effectively has demonstrated up scaled large cell sized >80 cm 2 MS-SOFC stack technology. This is followed by consortia involving the company Plansee. At last MS-SOFC stacking has been demonstrated within consortia consi...

Metal supported solid oxide fuel and electrolysis cells (SOFC/SOEC) impregnated with nanosized catalysts are attractive as highly efficient low cost cells operating at relatively low temperature. Recent studies have focused on catalysts based on Ni and gadolinia-doped ceria (CGO) at the fuel side of the cell, and in some cases with the addition of Fe. Here we investigate FeNi/CGO catalyst in relation to SOFC/SOEC fuel electrodes with focus on the Fe diffusion into Ni/CGO during catalyst reduction. The reduction process was followed by in-situ XRD and in situ TEM, and the experiments show that for low metal loadings the CGO nanoparticle size is unaffected by the presence of metals. However, for a high Fe loading the oxide particle size increases and Fe is widely spread in the catalyst, both, in the form of NiFe alloy and by converting most of the CGO to CeFeO3 and GdFeO3.

For use of metal supported SOFC in mobile applications it is important to reduce the thermal mass to enable fast start up, increase stack power density in terms of weight and volume and reduce costs. In the present study, we report on the effect of reducing the support layer thickness of 313 µm in DTU SoA MS-SOFCs gradually to 108 µm. The support layer thickness decrease in the DTU co-sintering MS-SOFC fabrication route results in an increased densification of the support layer and a slight decrease in performance. To mitigate the performance loss, the introduction of gas channels by puncturing of the green tape casted support layer was explored. In summary, it was successfully demonstrated on stack relevant sized 12 cm x 12 cm MS-SOFCs that the support layer thickness could be significantly reduced and that the cell performance could be significantly increased by the introduction of gas channels.

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LiFeO2 was investigated as an alternative anode material for the intermediate temperature solid oxide fuel cell. At 650°C in Argon with 5% H2, LFO exhibited good electronic conductivity of 5.1 Scm-1. Fuel cell testing of composite anode of 40 wt% LFO and 60 wt% GDC and cathode with 40 wt% La0.6Sr0.4CoO3 and 60 wt% GDC on Ce0.9Gd0.1O1.95 electrolyte-supported cell showed excellent performance at 625°C. In humidified H2 at 625°C, the cell had an OCV of 0.89V and an Rp of 0.28Ωcm2. It achieved a maximum power density of 136 mWcm-2.