As-Sintered Manganese-Stabilized Zirconia Ceramics with Excellent Electrical Conductivity

As promising electrolyte materials in intermediate-temperature solid oxide fuel cells (IT-SOFCs), Sc-stabilized ZrO2 (ScSZ) and Y-stabilized ZrO2 (YSZ) electrolytes continue to be plagued by high cost and low intermediate conductivity. To mitigate these problems, Mn has been chosen as a new stabiliz...

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Published in:Crystals (Basel) 2022-05, Vol.12 (5), p.620
Main Authors: Gao, Ling, Guan, Ruidong, Zhang, Shengnan, Zhi, Hao, Jin, Changqing, Jin, Lihua, Wei, Yongxing, Wang, Jianping
Format: Article
Language:English
Subjects:
Ceramics
Crystal lattices
Cubic lattice
Doping
Electrical properties
electrical property
Electrical resistivity
Electrolytes
Electrolytic cells
Grain boundaries
Grain size
intermediate-temperature solid oxide fuel sells
Manganese
microstructure
Mn-stabilized zirconia ceramics
Radiation
Sintering
Solid electrolytes
Solid oxide fuel cells
Yttria-stabilized zirconia
Zirconium dioxide
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Summary:As promising electrolyte materials in intermediate-temperature solid oxide fuel cells (IT-SOFCs), Sc-stabilized ZrO2 (ScSZ) and Y-stabilized ZrO2 (YSZ) electrolytes continue to be plagued by high cost and low intermediate conductivity. To mitigate these problems, Mn has been chosen as a new stabilization element for the synthesis of Mn-stabilized ZrO2 ceramics (MnSZ) through solid state sintering. Microstructures and electrical properties of micron-crystalline Zr1−xMnxO2−δ (x = 0.15, 0.20 and 0.25) ceramics electrolytes for IT-SOFCs have been systematically evaluated. Within the applied doping content, Mn2+ ions can enter the ZrO2 crystal lattice, leading to the formation of single cubic phase samples. Electrical conductivity measurements in the temperature range between 400 °C and 1000 °C show a sharp increase in conductivity due to Mn doping. The highest conductivity is obtained from the Zr0.75Mn0.25O2−δ samples, being 0.0144 S/cm at 600 °C and 0.182 S/cm at 1000 °C. The electrical conductivity at 600 °C is twice higher than that of the YSZ and two orders of magnitude higher than that of the ScSZ. These properties can fulfill the conductivity requirement (∼1 × 10−2 S/cm) for the electrolyte. Therefore, based on this study, we propose that Mn stabilized ZrO2 is a promising candidate as a solid electrolyte for IT-SOFCs.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst12050620