All-Perovskite Solid Oxide Fuel Cells, Synthesis and Characterization

2009 ◽  
Vol 6 (2) ◽  
Author(s):  
Alidad Mohammadi ◽  
Tsung-han Wu ◽  
Alevtina L. Smirnova ◽  
Jakub Pusz ◽  
Nigel M. Sammes
Keyword(s):  
Electrical Conductivity ◽  
Solid Oxide Fuel Cells ◽  
Sintering Temperature ◽  
Phase Evolution ◽  
Solid Oxide ◽  
Lanthanum Gallate ◽  
Synthesis And Characterization ◽  
Oxide Fuel ◽  
Characterization Study ◽  
Porous Anode

Strontium- and magnesium-doped lanthanum gallate (LSGM) has been considered as a promising electrolyte for solid oxide fuel cell (SOFC) systems in recent years. In this work synthesis, electrochemical properties, phase evolution, and microstructure of an all-perovskite electrolyte-supported SOFC based on La0.75Sr0.25Cr0.5Mn0.5O3 (LSCM) porous anode, La0.8Sr0.2Ga0.7Mg0.3O2.8 (LSGM-2030) electrolyte, and La0.8Sr0.2MnO3 cathode at intermediate temperatures are studied. The phase evolution of synthesized LSGM and LSCM powders has been investigated, and it validates that there is no reaction between LSGM and LSCM at sintering temperature. The characterization study of the synthesized LSGM also indicates that sintering at 1500°C gives higher electrical conductivity compared with the currently published results, while for the pellets sintered at 1400°C and 1450°C the conductivity would be slightly lower. The effects of the firing temperature on the bulk and grain boundary resistivities are also discussed.

scholarly journals Microstructure and electrical conductivity of 3Y-TZ/Al2O3 composites

2021 ◽  
Vol 15 (1) ◽  
pp. 19-31
Author(s):  
Katarzyna Obal ◽  
Jan Wyrwa ◽  
Andrzej Kruk ◽  
Małgorzata Dziubaniuk ◽  
Zbigniew Pędzich ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Solid Oxide Fuel Cells ◽  
Sintering Temperature ◽  
Polycrystalline Material ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Hydrothermal Crystallization ◽  
Crystallization Method ◽  
Alumina Addition ◽  
Total Resistivity

Various amounts of Al2O3 (0.25, 0.5 and 1.0mol%) were added to tetragonal polycrystalline material (3YTZP), prepared using the hydrothermal crystallization method. The effects of the added amount as well as the sintering temperature on the microstructure and electrical properties of the 3Y-TZP/Al2O3 composites were investigated. The alumina addition was found to affect the microstructure of the 3Y-TZP samples obtained after sintering at 1400 or 1500?C only to a slight extent. The lowest values of the blocking factor, which represents the contribution of grain boundary resistivity to the total resistivity of a polycrystal, were observed for the 3Y-TZP with Al2O3 additions of 0.25 or 0.5mol% at measurement temperatures of 550 and 600 ?C. The study proves that the 3Y-TZP/Al2O3 should be taken into consideration as solid electrolyte in the intermediatetemperature solid oxide fuel cells.

Effect of Bi-Layer Interconnector Design on the Current Density of Solid Oxide Fuel Cells

2009 ◽  
Author(s):  
Qiuyang Chen ◽  
Jian Zhang ◽  
Qiuwang Wang ◽  
Min Zeng
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Current Density ◽  
Porous Electrode ◽  
Solid Oxide ◽  
The Novel ◽  
Oxide Fuel ◽  
Plane Normal ◽  
Three Phase ◽  
Porous Anode

The concentration gradient of fuel and oxidant gas is great in the plane normal to the solid oxide fuel cells (SOFC) three-phase-boundary (TPB) layer, especially in the porous electrode. We present a novel interconnector design, termed bilayer interconnector, for SOFC. It can distribute the fuel and air gas in the plane normal to the SOFC TPB layer. In this paper, we develop a 3D model to study the current density of the SOFC with conventional and novel bi-layer interconnectors. The numerical results show that the novel SOFC design Rib1 can slightly enhance the mass transfer in the porous anode and current density. The novel SOFC design Rib2 can improve the current density significantly under low electrical conductivity of interconnector.

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