chem584.ionic conduction - Pure zirconia is a low ionic...

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1 Ionic Conduction Ionic Conduction
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2 Solid Electrolytes Ion Transport & Defects
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3 Ion Transport & Frenkel Defects
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4 Ion Conductors Ion Conductors
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5 Ideal Solid Electrolytes Ideal Solid Electrolytes
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6 Ion Conductors Applications of Ionic Conductors
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7 Solid Oxide Fuel Cell (SOFC) Solid Oxide Ceramic as electrolyte (ZrO 2 or CaO) Efficiency is <60% Operating temperatures are about 1,000 C Cells output is up to 100 kW. At such high temperatures a reformer is not required to extract hydrogen from the fuel SOFC units and they tend to be rather large. Power Fuel Cells
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8 YSZ: yttria stabilized zirconia Solid Oxide Fuel Cell Materials
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9 Ideal Oxide Conductors Zirconia Phase Transisitons
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10 Zirconia Stabilization Pure zirconia undergoes lattice changes when heated: cracks over time. Fully stabilized zirconia (F-YSZ, ~8 mol% Y 2 O 3 ) has no lattice changes from room temperature up to 2500C.
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Unformatted text preview: Pure zirconia is a low ionic conductor. Addition of aliovalent (different valent) oxides forms oxygen ion vacancies. Ideal Oxide Conductors 11 Solid Oxide Fuel Cell Materials Rechargeable Li Ion Battery 12 Li Ion Battery Cathodes Li Ion Battery Cathodes bad good bad good 13 Li Ion Battery Cathodes bad good bad bad Li Ion Battery Cathodes very bad bad good bad good 14 Oxygen Gas Sensor (Automotive) ZrO 2 oxygen sensor Bosch (Germany) and NTK (Japan) are largest manufacturers of so-called lambda sensors. Oxygen Gas Sensor (Automotive) 3-Way Catalytic Converter : decrease carbon monoxide, hydrocarbon and NOx emissions using Oxid+Red catalysts (Pt, Rh, Pd) Air-to-fuel ratio very close to the stoichiometric point, using lambda sensor. At this ratio, all of the fuel will be burned using all of the oxygen in the air. 15 Oxygen Gas Sensor (Automotive)...
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This note was uploaded on 12/04/2011 for the course CHEM 584 taught by Professor Suslick,k during the Fall '08 term at University of Illinois, Urbana Champaign.

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chem584.ionic conduction - Pure zirconia is a low ionic...

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