Effect of Mn-doping on stability of Scandia stabilized zirconia electrolyte under dual atmosphere of solid oxide fuel cells

The effect of Mn-doping on the stability of ScSZ electrolyte under dual atmosphere of solid oxide fuel cells (SOFCs) was investigated in this study. Scandia stabilized zirconia electrolytes with and without 5 mol % MnO2 (ScSZ and Mn–ScSZ) were annealed under dual atmosphere of air and 1.2%H2O–H2 at T = 1273 K. The surfaces of the ScSZ electrolytes in the air side were not changed after annealing. On the other hand, the surface of the Mn–ScSZ electrolyte in the fuel side was damaged; fine particles were formed on the surface and increased with time. After annealing for 4 weeks, dusting of the electrolyte surface was observed. Mn-doping to ScSZ and annealing under dual atmosphere simulating SOFCs induced the degradation of ScSZ electrolyte.