International Journal of Hydrogen Energy, Volume 40, Issue 1, 2015, Pages 561-567.
Wei Jiang, Bo Wei, Zhe Lv, Zhi Hong Wang, Lin Zhu, Yi Qian Li.
Center for Condensed Mater Science and Technology, Department of Physics, Harbin Institute of Technology, Harbin 150001, PR China.
The performance and stability of the Sm0.5Sr0.5CoO3–Ce0.8Sm0.2O1.9 composite with a weight ratio of 7:3 (SSC-SDC73) were studied and evaluated as oxygen electrode of high temperature solid oxide electrolysis cells (SOECs). The co-synthesized SSC-SDC73 oxygen electrode exhibited better electrochemical activity and stability than that of physically mixed one for the oxygen oxidation reaction. The effect of anodic polarization current on the co-synthesized SSC-SDC73 oxygen electrode was further investigated under the relative low and high currents at 800 °C in air, respectively. The obtained results demonstrated that co-synthesized SSC-SDC73 oxygen electrode exhibited a better stability under low anodic polarization current. While a higher anodic polarization current could promote the slight agglomerate and delamination of the electrode. Therefore, the polarization current is a key operating parameter for SSC-SDC73 oxygen electrode under the SOEC operation conditions.