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A nano-structured La_0.8Sr_0.2Co_0.5Fe_0.5O₃+Y₂O₃ doped ZrO₂ (LSCF+YSZ) composite cathode was prepared by impregnation of a LSCF-containing solution into porous YSZ structure presintered on the YSZ electrolyte. The result shows that the LSCF phase was formed at 700°C, forming a nano-structured, effective and functional LSCF+YSZ composite cathode that not only produces high triple phase boundaries for the O₂ reduction reaction, but also provides a structurally stable interface between the LSCF and YSZ. The electrode polarization resistance for the O₂ reduction reaction is from 0.539 to 0.047Ωcm² between 600 and 750°C, indicating the promising potential the LSCF+YSZ as a high performance cathode for intermediate temperature solid oxide fuel cells.