ABSTRACT
The degradation of solid oxide electrolysis cell (SOEC) materials is much more challenging when the cell or stack is cycled between fuel cell and electrolysis cell modes. Compared with that of the electrolyte or the fuel electrode, the degradation of the oxygen electrode appears to be a more significant factor in cell/stack failure, particularly at high currents. The delamination of the electrode should be considered first, and the most widely observed phenomenon is delamination between the interface of the oxygen electrode and the electrolyte. The strategy such as putting an additional thin layer between the electrode and electrolyte to suppress the interdiffusion was proposed. Aside from delamination of electrodes, the poisoning of the oxygen electrode in solid oxide fuel cell was reported in many research papers. For fuel electrodes in SOEC, aside from impurity poisoning, another issue of reduction and oxidation can also cause the instability of fuel electrode.
