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Effect of Mixed‐Conducting Interfacial Layers on Solid Oxide Fuel Cell Anode Performance
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1998
Year
EngineeringElectrode-electrolyte InterfaceInterfacial LayersChemical EngineeringCharge Carrier TransportElectrochemical InterfaceMaterials ScienceElectrical EngineeringOxide ElectronicsInterlayer ThicknessEnergy StorageElectrochemical CellElectrical PropertyElectrochemistryMetal AnodeSurface ScienceApplied PhysicsYsz Surface RoughnessThin FilmsLayer Thicknesses
The interfacial resistance of Ni‐‐stabilized (Ni‐YSZ) anodes on YSZ electrolytes has been reduced by inserting thin interfacial layers of ‐doped YSZ (YZT) or ‐doped , (YDC). Impedance spectroscopy measurements at temperatures ranging from 600 to 750°C typically showed a high frequency arc (HFA) and a low frequency arc (LFA). The HFA was reduced by the addition of either interlayer, with a larger reduction for YDC. This presumably resulted from enhanced charge transfer due to the mixed conductivity and/or enhanced redox reaction rate of the interfacial layer. The LFA, which was apparently related to mass‐transport processes, grew with decreasing YSZ surface roughness and increasing interlayer thickness. The overall interfacial resistance was minimized for layer thicknesses of ∼0.5 μm. The lowest interfacial resistances in 97% , 0.13 Ω cm2 at 750°C, and 0.29 Ω cm2 at 600°C, were obtained with 0.5 μm thick YDC interfacial layers.