A New Electroactive and Stable Electrode Based on Praseodymium Molybdate for Symmetrical SOFCs
Н. В. Лысков, A. I. Kotova, D. I. Petukhov, S.Ya. Istomin, Г. Н. Мазо
Abstract
The electrochemical activity of a new electrode material based on Pr5Mo3O16 + δ (РМО) within the composition of a symmetrical solid oxide fuel cell (S-SOFC) of the electrolyte-supported design is studied. The model S-SOFC of the РМО/Ce0.9Gd0.1O1.95(GDC)/Zr0.84Y0.16O1.92(YSZ)/GDC/PMO composition demonstrated the maximum power density of 28 mW/cm2 at 900°С. To improve the power characteristics of S-SOFC, the porous buffer GDC layer is modified by the method of Pr6O11 infiltration. It is found that the addition of electroactive Pr6O11 into the GDC buffer layer provides the three-fold increase in the fuel-cell power density with the maximum of 90 mW/cm2 at 900°С. The 10 h life-time test of the model S-SOFC with the РМО/GDC + Pr6O11/YSZ/GDC + Pr6O11/PMO composition carried out at a load of 0.7 V reveals the absence of any considerable degradation in fuel cell power characteristics. The results obtained suggest that the new electrode material based on PMO holds promise for the development of S-SOFC.