An improved direct current sintering technique for proton conductor — BaZr0.1Ce0.7Y0.1Yb0.1O3: The effect of direct current on sintering process

BaZr0.1Ce0.7Y0.1Yb0.1O3 (BZCYYb), a promising proton conductor of poor sinterability used in solid oxide fuel cells (SOFCs), has been densified in 1 h at 850 C using a direct current sintering technique (DC-sintering). Under a constant electrical field, the current density through the specimen of BZ...

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Bibliographic Details
Published in:Journal of power sources 2014, Vol.248, p.70-76
Main Authors: Jiang, Taizhi, Liu, Yajie, Wang, Zhenhua, Sun, Wang, Qiao, Jinshuo, Sun, Kening
Format: Article
Language:English
Subjects:
Applied sciences
Conductors (devices)
Constraining
Current density
Direct current
Electrolytes
Energy
Energy. Thermal use of fuels
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Fuel cells
Grain size
Resistivity
Sintering
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Summary:BaZr0.1Ce0.7Y0.1Yb0.1O3 (BZCYYb), a promising proton conductor of poor sinterability used in solid oxide fuel cells (SOFCs), has been densified in 1 h at 850 C using a direct current sintering technique (DC-sintering). Under a constant electrical field, the current density through the specimen of BZCYYb rises rapidly when the temperature increases to a certain value. In the DC-sintering process, the current density is restricted when the sharp increase occurs. By limiting current density to different values for 1 h, it is found that current density is the most important factor in the DC-sintering process. The conductivity and the grain size of the BZCYYb electrolyte increase significantly with the enhanced current density, while the different initial applied electrical fields have a negligible effect. The stable stage of DC-sintering process can be explained by Joule heating. The corresponding real temperature of the specimens is estimated by applying black body radiation theory.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2013.09.042