Performance of reversible solid oxide cells based on La_0.6Ca_0.4Fe_0.7Sc_0.1Ni_0.2O_3−δ oxygen electrode

Hydrogen energy is recognized as the most potential energy carrier in the 21st century. Reversible solid oxide cells (RSOCs) have attracted more and more attention due to their efficient use of hydrogen for power generation and efficient hydrogen production from water electrolysis. Numerous studies have shown the polarization loss and decay of oxygen electrodes are the technical bottlenecks hindering RSOCs development. In this work, 10% mol Sc-doped La_0.6Ca_0.4Fe_0.7Sc_0.1Ni_0.2O_3−δ (LCFSN) material was prepared, and the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) of this material were studied in detail by half cell. It is found that ORR catalytic activity of LCFSN is better than the OER. The Ni-YSZ/YSZ/GDC/LCFSN full cells were assembled and their electrochemical performances in fuel cell mode (SOFC) and electrolysis cell mode (SOEC) were investigated in detail. The maximum power density can reach 1.471 W/cm² at 800 ℃ with H₂ as fuel. And the hydrogen production rate is as high as 627 mL/(cm²·h) at 750 ℃, 50 %H₂O and 1.3 V. In addition, the cell has no obvious degradation in the 100 h stability test and has good stability. These results prove that LCFSN is a promising oxygen electrode material.