Low temperature solid oxide fuel cells based on Sm_0.2Ce_0.8O_1.9 films fabricated by slurry spin coating

A simple and effective slurry spin coating approach was developed for fabricating Sm_0.2Ce_0.8O_1.9 (SDC) films on porous NiO-SDC anode substrates. A dense SDC film with a thickness of ∼15 μm was obtained after sintering at 1400 °C for 4 h. With the same approach, the novel Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ (BSCF)-SDC composite cathode layer was fabricated on the film. When dry hydrogen was used as the fuel and stationary air as the oxidant, maximum power densities of the cell were 648 mW cm^-2 at 600 °C and 869 mW cm^-2 at 650 °C, respectively. AC impedance analysis indicated that the resistance of the cell under open-circuit conditions was essentially dominated by the interfacial resistance. The activation energies of the interfacial resistance and the ohmic resistance were 99.49 and 54.30 kJ mol^-1, respectively.