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Low‐Temperature Solid‐Oxide Fuel Cells Utilizing Thin Bilayer Electrolytes
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1997
Year
Materials ScienceYdc Electrolyte SofcsElectrical EngineeringSolid‐oxide Fuel CellsEngineeringOxide ElectronicsAdvanced Electrode MaterialEnergy StorageHigh Open‐circuit VoltageBatteriesElectrochemical CellThin FilmsElectrochemical ProcessElectrochemistry
Solid‐oxide fuel cells (SOFCs) with electrolytes that provide high open‐circuit voltage (OCV) and low ohmic loss down to 550°C are described. The electrolytes were bilayers consisting of a 4 to 8 μm thick Y‐doped ceria (YDC) layer with a 1 to 1.5 μm thick Y‐doped zirconia (YSZ) layer on the fuel side. The cathode/supports were . The anodes consisted of thin YDC and Ni‐YSZ layers. The YDC/YSZ electrolyte SOFCs yielded 85 to 98% of the theoretical OCV, compared with ≈50% for YDC electrolyte SOFCs. The cathode overpotential, which was a main factor limiting SOFC power density, was lower for YDC/YSZ than YSZ electrolytes. The maximum power density at 600°C, 210 mW/cm2, is higher than for previously reported SOFCs.