STRONTIUM-DOPED LANTHANUM MANGANATE CATHODE DEGRADATION DUE TO A DECOMPOSED HYDROGEN PEROXIDE OXIDANT FEED STREAM

摘要

Decomposed hydrogen peroxide (H_2O_2) contains excess moisture and stabilizers that can deteriorate SOFC performance and durability markedly in the cathode. A numerical study is performed for a strontium-doped lanthanum manganatc and yttria stabilized zirconia (LSM-YSZ) composite cathode using an oxidant stream consisting of a 20% O_2 and 80% H_2O mixture to study the detailed reaction mechanism and local transport and polarization phenomena. Specifically the 1-D cathode model couples multi-component gas and charge transport with an oxygen reduction mechanism. The model is validated with data from the literature and used to study the transport effect only of H_2O in the cathode. Future work will consider the effect of H_2O on the electrochemical reaction mechanism.