Microstructure and Electrical Conductivity of Yttria-Stabilized Zirconia with Lithium Addition

2014 ◽  
Vol 798-799 ◽  
pp. 413-418
Author(s):  
Eliana Navarro Santos Muccillo ◽  
C.S. Campos ◽  
R. Muccillo
Keyword(s):  
Electrical Conductivity ◽  
Solid Oxide Fuel Cells ◽  
Lithium Fluoride ◽  
Solid Electrolytes ◽  
Sintering Temperature ◽  
Lithium Carbonate ◽  
Yttria Stabilized Zirconia ◽  
Lithium Metal ◽  
Stabilized Zirconia ◽  
Metal Basis

Yttria-stabilized zirconia is a singular polycrystaline ceramic with a range of technological applications. The combination of its physical properties is responsible for application as solid electrolytes in solid oxide fuel cells. High densification is required for this and other applications. The sintering of this solid electrolyte is still a matter of investigation. To reduce the sintering temperature, the introduction of additives is an effective approach. In this work, the effects of lithium addition on microstructure and electrical conductivity of 8 mol% yttria-stabilized zirconia was studied by scanning electron microscopy and impedance spectroscopy, respectively. Cylindrical pellets were prepared by pressing, followed by sintering at 1200oC without and with 1 and 2 mol% lithium (metal basis). As precursor materials both lithium carbonate and lithium fluoride were used. The main microstructure features were correlated with the results of electrical conductivity.

Optimized Sol–Gel Routes to Synthesize Yttria-Stabilized Zirconia Thin Films as Solid Electrolytes for Solid Oxide Fuel Cells

2012 ◽  
Vol 24 (23) ◽  
pp. 4540-4548 ◽  
Author(s):  
Emilie Courtin ◽  
Philippe Boy ◽  
Clément Rouhet ◽  
Luc Bianchi ◽  
Eric Bruneton ◽  
...  
Keyword(s):  
Thin Films ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Electrolytes ◽  
Sol Gel ◽  
Solid Oxide ◽  
Yttria Stabilized Zirconia ◽  
Oxide Fuel ◽  
Stabilized Zirconia

Optimization of SDC Interlayer for YSZ-Based IT-SOFCs

2014 ◽  
Vol 1082 ◽  
pp. 69-72
Author(s):  
Shou Cheng He ◽  
Han Chen ◽  
Lu Cun Guo
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Screen Printing ◽  
Sintering Temperature ◽  
Solid Oxide ◽  
Yttria Stabilized Zirconia ◽  
Doped Ceria ◽  
Stabilized Zirconia ◽  
Screen Printing Method ◽  
Ysz Electrolyte ◽  
A Current

Inserting a porous samaria-doped ceria (SDC) interlayer between yttria-stabilized zirconia (YSZ) electrolyte and anode is an effective method to enhancing the performance of intermediate-temperature solid oxide fuel cells (IT-SOFCs). In this work, the microstructure and morphology of the SDC interlayer were optimized by varying its thickness and sintering temperature. Results show that the SDC interlayer fabricated by utilizing once screen printing method and then sintered at 1300 °C for 2 h obtains the best electrochemical performance. The resulting polarization resistance and anodic overpotential (at a current density of 0.05 Acm-2) were 0.84 Ωcm2 and 0.07 V at 800 °C in H2, reduced by factors of 4.7 and 5.6, respectively, when compared with the LSCM anode without the SDC interlayer.

Development of Zirconia Electrolyte Films on Porous Doped Lanthanum Manganite Cathodes by Electrophoretic Deposition

1999 ◽  
Vol 575 ◽  
Author(s):  
R. N. Basu ◽  
C. A. Randall ◽  
M. J. Mayo
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Electrophoretic Deposition ◽  
Yttria Stabilized Zirconia ◽  
Lanthanum Manganite ◽  
Ceramic Powders ◽  
Stabilized Zirconia ◽  
Uniform Coating ◽  
Cathode Tube ◽  
Zirconia Film ◽  
Zirconia Electrolyte

ABSTRACTElectrophoretic deposition (EPD) was explored as an inexpensive route for fabricating the 8mol% yttria stabilized zirconia electrolyte in solid oxide fuel cells (SOFCs). Normally, deposition of particulate ceramic powders onto a sintered porous surface yields a non uniform coating which, after sintering, results in porosity, surface roughness and cracking in the coating. To overcome this problem, the present study used a fugitive graphite interlayer between the porous air electrode supported (AES) cathode tube (doped-LaMnO3) and the deposited zirconia film. By this approach, a fairly dense green coating (˜ 60%) was obtained, which yielded a smooth surface and pore-free microstructure after sintering. Preliminary results on the effect of a fugitive interlayer on the unfired (green) and fired zirconia coatings are discussed.

Smart Processing of Solid Electrolyte Dendrites with Ordered Porous Structures for Fuel Cell Miniaturizations

2011 ◽  
Vol 2011 (CICMT) ◽  
pp. 000017-000022
Author(s):  
Soshu Kirihara ◽  
Katsuya Noritake ◽  
Satoko Tasaki ◽  
Hiroya Abe
Keyword(s):  
Fuel Cell ◽  
Solid Electrolyte ◽  
Solid Electrolytes ◽  
Yttria Stabilized Zirconia ◽  
Porous Structures ◽  
Stabilized Zirconia ◽  
Coordination Numbers ◽  
Aspect Ratios ◽  
Micro Patterning ◽  
Ordered Porous

Solid electrolyte dendrites of yttria stabilized zirconia with spatially ordered porous structures were successfully fabricated for fuel cell miniaturizations by using micro patterning stereolithography. Micrometer order ceramic lattices with the coordination numbers 4, 6, 8 and 12 were propagated spatially in computer graphic space. Aspect ratios of the lattice diameters and lengths were designed between 1.0 and 2.0 to value the porosities in higher levels from 50 to 80 %. On the fabrication process, nanometer sized yttria stabilized zirconia were dispersed in to photo sensitive liquid resins at 30 % in volume fraction to obtain thixotropic slurries. The paste material was spread on a grass substrate with 10 μm in layer thickness by using mechanic knife edge movements, and an ultra violet micro pattern was exposed on the surface to create cross sectional solid layer with 2 μm in part accuracy. After the layer stacking process, the ceramic dispersed resin lattices of 100 μm in diameter were obtained exactly. These composite precursors were dewaxed and sintered at 600 and 1500 °C in an air atmosphere, respectively, and the fine ceramic lattices of 98 % in relative density were created. Gaseous fluid profiles and pressure distributions in the formed ceramic lattices with the various coordination numbers and porosity percents were visualized and analyzed by using finite element method. The fabricated solid electrolytes with the extremely high porosities and wide surface areas are expect to be applied to novel electrodes in the compact fuel cells. The smart processing of the solid electrolytes by utilizing computer aided design, manufacturing and evaluation methods will be demonstrated.

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