Abstract
In this study, the oxygen transport through a solid oxide fuel cell type reactor was studied. LSM, YSZ and LaAlO were used as the cathode, the electrolyte and the anode, respectively. The oxygen permeation flux using helium as carrier gas in the anode side was 3.50x10-7 mol m-2 s-1 at 1273 K with the activation energy of 170 kJ mol-1. Changing carrier gas into methane, oxygen permeation fluxes are 1-2 orders of magnitude higher than those under helium feed. The effects of applied potentials were also investigated. The oxygen permeation fluxes were increased and the activation energies of oxygen permeation were decreased with applied potentials in both cases of helium flow and methane feed. The model of oxygen permeation was presented and the permeation parameters were proposed. In the helium case, the oxygen permeation at the LaAlO anode was the rate-limiting step for the oxygen permeation. However, in the methane case, the resistances in the three parts (LSM/YSZ/LaAlO) were comparable.
