Mesoporous tungsten oxide electrodes for YSZ-based mixed potential sensors to detect NO2 in the sub ppm-range
Xiaohong ZhengCheng ZhangJinfeng XiaGuohong ZhouDanyu JiangShiwei WangXin LiYibo ShenMengting DaiBing WangQiang Li
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A new class of binary mesoporous yttria–zirconia(YZ) and ternary mesoporous metal-YZ materials (M=electroactive Ni/Pt) is presented here (the Figure shows PtYZ) that displays the highest surface area of any known form of yttria-stabilized zirconia. These mesoporous materials form as solid solutions and retain their structural integrity to 800 °C, which bodes well for their possible utilization in fuel cells.
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Fast ion conductor
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The yttria-doped mesoporous zirconia was successfully synthesized by evaporation induced self-assembly (EISA) method, and the microstructure and textural properties of the as-made product were studied extensively. The results showed that the as-made product possessed crystallized framework walls and a worm-like mesopore with a narrow pore distribution. The BET specific surface area and pore volume of the as-made product calcined at 500°C are 111 m 2 /g and 0.16 cm 3 /g respectively, and the corresponding data changed to 73 m 2 /g and 0.052 cm 3 /g after calcined at 700°C, which indicated that the as-made yttria-doped mesoporous zirconia possess a higher thermal stability.
Specific surface area
Thermal Stability
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The electrical conductivity and the crystal structure of specimens with 8 mol% and 10 mol% yttria were determined before and after annealing at 1000°C. Scandia-stabilised zirconia electrolytes (ScSZ) were investigated too, with an scandia content varying from 7 mol% to 13 mol%. Like for YSZ electrolytes, the electrical conductivity was measured and crystal structure was determined before and after annealing. Mechanical spectroscopy was performed on this system. Then, the electrical data and the structure analyses of both systems are correlated to each other and discussed. Finally, according to the literature and to the presented results, an interpretation is given for the ageing effect for all the zirconia-based electrolytes.
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Nanocrystalline yttria-stabilized zirconia (ZrO2-8 mol%Y2O3, 8YSZ) was synthesized by a homogeneous precipitation process using urea as the precipitation agent. Zirconia (ZrO2) transparent ceramics samples have been successfully fabricated by a microwave sintering process at low temperature. The technologies of low-temperature microwave sintering and the relationships of the microstructures and properties of the specified samples have been investigated in detail. We have found out that the low-temperature microwave sintering has its obvious advantages over the other methods in manufacturing zirconia transparent ceramics.
Nanocrystalline material
Transparent ceramics
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Single wall carbon nanotube reinforced yttria stabilized zirconia ceramic materials have been obtained by means of spark plasma sintering technique. Single wall carbon nanotubes were treated in an acid solution before mixing with zirconia powders to obtain a uniform distribution of both powders. This method allows obtaining ceramic materials with a grain size between 200 nanometers and 1 micron and with a grain size distribution which depends on processing conditions. This new route opens a new perspective for new ceramic composites tailoring with enhanced mechanical properties as structural materials
Spark Plasma Sintering
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