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자료유형
학술저널
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한국전기전자재료학회 Transactions on Electrical and Electronic Materials Transactions on Electrical and Electronic Materials 제15권 제4호
발행연도
2014.1
수록면
189 - 192 (4page)

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Yttria-stablized zirconia (YSZ) is the most commonly used electrolyte material, but the reduction in workingtemperature leads to insufficient ionic conductivity. Ceria based electrolytes (GDC) are more attractive in termsof conductivity at low temperature, but these materials are well known to be reducible at very low oxygen partialpressure. The reduction of electrolyte resistivity is necessary to overcome cell performance losses. So, thin YSZ/GDCbilayer technology seems suitable for decreasing the electrolyte resistance at lower operating temperatures. Bilayerelectrolytes composed of a galdolinium-doped CeO2 (Ce0.9Gd0.1O1.95, GDC) layer and yttria-stabilized ZrO2 (YSZ) layerwith various thicknesses were deposited by RF sputtering and E-beam evaporation. The bilayer electrolytes weredeposited between porous Ni-GDC anode and LSM cathode for anode-supported single cells. Thin film structure andsurface morphology were investigated by X-ray diffraction (XRD), using CuKα-radiation in the range of 2ce morphol℃. The XRD patterns exhibit a well-formed cubic fluorite structure, and sharp lines of XRD peaks can be observed,which indicate a single solid solution. The morphology and size of the prepared particles were investigated by fieldemissionscanning electron microscopy (FE-SEM). The performance of the cells was evaluated over 500~800℃, usinghumidified hydrogen as fuel, and air as oxidant.

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