Development of vacuum plasma sprayed thin-film SOFC for reduced operating temperature

Schiller, Günter; Henne, R.; Lang, Michael; Ruckdäschel, R.; Schaper, S.

doi:10.1016/s1464-2859(00)88860-4

Cited by 72 publications

(33 citation statements)

References 2 publications

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“…These high temperatures tend to lead to serious corrosion of the metallic substrate. To solve the problem, different processing routes to fabricate electrodes and dense electrolytes on metallic supports have been employed, such as atmospheric plasma spray processing (APS) [3], vacuum plasma spraying (VPS) [4], suspension plasma spraying [5], high-velocity oxy-fuel (HVOF) spraying of liquid suspension feedstock [6], pulsed laser deposition (PLD) [7] and high temperature co-sintering in reducing atmosphere [1;8;9]. DTU Energy Conversion (part of former Risø DTU, hereafter referred to as DTU) has developed an unconventional cell design based on porous and highly electronically conducting layers into which electrocatalytically active anode materials (CGO and minor amounts of Ni) are infiltrated after sintering [10].…”

Section: Introductionmentioning

confidence: 99%

Break‐down of Losses in High Performing Metal‐Supported Solid Oxide Fuel Cells

et al. 2013

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Metal supported SOFC designs offer competitive advantages such as reduced material costs and improved mechanical robustness. On the other hand, disadvantages might arise due to possible corrosion of the porous metal parts during processing and operation at high fuel utilization. In this paper we present the results of performance and stability improvements for a metal supported cell developed within the European project METSOFC and the Danish National Advanced Technology Foundation. The cells consist of a porous metal backbone, a metal / zirconia cermet anode and a 10ScYSZ electrolyte, cofired in hydrogen. The electrochemically active parts were applied by infiltrating CGO-Ni precursor solution into the porous metal and anode backbone and screenprinting (La,Sr)(Co,Fe)O 3 -based cathodes. To prevent a solid state reaction between cathode and zirconia electrolyte, CGO buffer layers were applied in between cathode and electrolyte. The detailed electrochemical characterization by means of impedance spectroscopy and a subsequent data analysis by the distribution of relaxation times enabled us to separate the different loss contributions in the cell. Based on an appropriate equivalent circuit model, the ohmic and polarization losses related to the gas diffusion in the metal support, the electrooxidation in the anode functional layer and the oxygen reduction in the mixed ionic electronic conducting cathode were determined. An additional process with a rather high relaxation frequency could be attributed to the formation of insulating interlayers at the cathode/electrolyte-interface. Based on these results, selective measures to improve performance and stability, such as (i) an improved PVD-deposited CGO buffer layer, (ii) LSC-CGO based in-situ sintered cathodes and (iii) reduced corrosion of the metal support were adopted and validated.

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Section: Introductionmentioning

confidence: 99%

Break‐down of Losses in High Performing Metal‐Supported Solid Oxide Fuel Cells

et al. 2013

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“…The electrical conductivity parallel to the lamellar direction of plasma-sprayed YSZ coating was reached onehalf of corresponding bulk materials. 20) Mineshige et al reported an electrical conductivity of about 750 SÁcm À1 at 1000 C for a sintered bulk La 0:5 Sr 0:5 -CoO 3 , 12) while the maximum electrical conductivity of the annealed plasma-sprayed LSCO was about 377 SÁcm À1 at 1000 C as shown in Fig. 5.…”

Section: Effect Of Annealing Treatment On Electrical Conductivity Of mentioning

confidence: 94%

“…The result is consistent with those previous findings. 20) It has been reported that deficiency of oxygen in the lattice of LSCO influences significantly the electrical conductivity.…”

Section: Effect Of Annealing Treatment On Electrical Conductivity Of mentioning

confidence: 99%

Characterization of the Microstructure and Electrical Conductivity of Plasma-Sprayed La0.5Sr0.5CoO3 Coating

Gao

Zhou

et al. 2006

Mater. Trans.

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Lanthanum strontium cobalt oxide (LSCO) has been employed as cathode and intercollector materials for solid oxide fuel cells (SOFCs). In the present study, the La 0:5 Sr 0:5 CoO 3 layer was deposited by atmospheric plasma spray (APS). The effect of heat treatment on microstructure and electrical conductivity of the LSCO deposits was examined. The electrical conductivity of the deposits along the lamellar direction was measured by a four-probe dc approach. The microstructure of the deposit was characterized by scanning electron microscopy and X-ray diffraction analysis. The results showed that the electrical conductivity of plasma-sprayed LSCO coating was lower than that of sintered bulk material with the same composition. The minor metastable phase in the as-sprayed coating reduced the electrical conductivity. The annealing treatment at 1000 C led to the elimination of the metastable phase and improved the electrical conductivity. The lamellar structure features with the limited interface bonding limits the electrical conductivity.

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“…This prevents formation of undesired phases in the course of synthesis, thus broadening the scope of electrode materials which can be used as electrolyte substrates. Among these methods, the most developed are different versions of Chemical Vapor Deposition (CVD) and Plasma Deposition (either in air or in vacuum) (Yamane & Hirai, 1987;Schiller et al, 2000;Minh, 1993).…”

Section: Introductionmentioning

confidence: 99%