Scandia-stabilized zirconia electrolyte for solid oxide fuel cells with improved reducing atmosphere stability

摘要

Disclosed is a scandia-stabilized zirconia electrolyte for a solid oxide fuel cell, which is configured such that at least one oxide selected from among gadolinium oxide (Gd2O3) and samarium oxide (Sm2O3) is co-doped with ytterbium oxide (Yb2O3) to thus improve stability in a reducing atmosphere. The scandia-stabilized zirconia electrolyte of the invention can be stabilized into a cubic crystal structure at room temperature while retaining the inherently high oxygen ionic conductivity of a scandia-stabilized zirconia electrolyte (11ScSZ), and can also ensure stability in a reducing atmosphere by solving the problem with a conventional ceria (CeO2)-doped scandia-stabilized zirconia in which the ionic conductivity continuously deteriorates in a reducing atmosphere.