Fabrication and Characterization of a Gd 0.2 Ce 0.8 O 2−δ– Sm 0.5 S r0.5 CoO 3-δ Composite Cathode for an Intermediate-Temperature Solid Oxide Fuel Cell

The anode supported solid oxide fuel cell of yittria-stabilized zirconia (YSZ) based electrolyte with cell structure of NiO-YSZ | YSZ | Gd 0.2 Ce 0.8 O 2-δ (GDC) | GDC-Sm 0.5 Sr 0.5 CoO 3 − d (SSC), is investigated. The SEM results show that the YSZ thin film is dense and the thickness is 5 mm. The maximum power densities are 608 and 104 mWcm -2 at the temperatures of 800 and 600 o C, respectively. The cell has been operated for long term test and the results show that the anode porosity is critical for the stability of the cell performance. The results of the variation of the contact pressure between the current collectors and the cell show that its effect on the performance efficiency is intensively enhanced at the high current density region.