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.

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 Effect Of The Gadolinium Oxide Addition On The Electrical Properties Of Tetragonal Zirconium Dioxide

2015 ◽  
Vol 60 (2) ◽  
pp. 993-998 ◽  
Author(s):  
J. Cyran ◽  
J. Wyrwa ◽  
E. Drożdż ◽  
M. Dziubaniuk ◽  
M. Rękas
Keyword(s):  
Electrical Conductivity ◽  
Solid Oxide Fuel Cells ◽  
Zirconium Dioxide ◽  
Tetragonal Zirconia ◽  
Solid Oxide ◽  
The Other ◽  
High Porosity ◽  
Oxide Fuel ◽  
Oxide Addition ◽  
Electrical Conductivities

Abstract The aim of this work was examination of gadolinium-doped 3YSZ electrical and structural properties. Such materials may be used as electrolytes in intermediate temperature solid oxide fuel cells (IT-SOFC). First step of the research was synthesis of 3YSZ with different contents of gadolinium (0.25; 0.5; 1.0 at %). Prepared materials were characterized by high porosity. No effect of gadolinium addition on grain size was observed. The experimentally determined values of grain interiors electrical conductivities for gadolinium doped samples are comparable to grain interior conductivities of gadolinium free tetragonal zirconia. On the other hand, a clear effect of gadolinium addition on electrical conductivity of grain boundaries was observed. It was found that 3YSZ containing 0.25 at. % Gd was the most promising from the investigated materials as a solid electrolyte for IT SOFC.

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