Steam Electrolysis vs. Co-Electrolysis: Mechanistic Studies of Long-Term Solid Oxide Electrolysis Cells

High-temperature electrolysis using solid oxide cells (SOECs) is an innovative technology to temporarily store unused electrical energy from renewable sources. However, they show continuous performance loss during long-term operation, which the main issue preventing their widespread use. In this work, we have performed stability tests up 1000 h under steam and co-electrolysis conditions commercial NiO-YSZ/YSZ/GDC/LSC single in order understand degradation process. The were carried out at different temperatures fuel gas compositions. Intermittent AC- DC- measurements characterize determine responsible electrode processes for operation. An increased rate observed 800 °C compared 750 conditions. Moreover, a lower noticed operation comparison Finally, post-test analyses SEM-EDX XRD mechanism. delamination of LSC °C, however, such not addition, Ni-depletion agglomeration are on side all cells.