Tripković Đorđije, Küngas Rainer, Mogensen Mogens Bjerg, Hendriksen Peter Vang
Department of Energy Conversion and Storage, Technical University of Denmark, Fysikvej Building 310, DK-2800 Kgs, Lyngby, Denmark.
Phys Chem Chem Phys. 2020 Jul 21;22(27):15418-15426. doi: 10.1039/d0cp02464c. Epub 2020 Jun 30.
The oxygen exchange activity of thin dense LaSrFeO electrodes prepared by pulsed laser deposition was investigated by electrochemical impedance spectroscopy and electrical conductivity relaxation below 600 °C. The value of the surface exchange coefficient (k) measured at 491 °C decreased from an initial 4.4 × 10 cm s to 1.7 × 10 cm s after aging for 7 days. The rapid decrease in the oxygen exchange rate was accompanied by the increase in the surface concentration of 'non-lattice strontium' detected by X-ray photoelectron spectroscopy. Subsequent electrochemical tests over 40 days showed that the electrode performance could be recovered by rinsing the passivated electrode in deionized water. Repeated treatments eventually also led to improved stability of electrochemical performance.
通过电化学阻抗谱和低于600°C的电导率弛豫研究了脉冲激光沉积制备的致密LaSrFeO薄膜电极的氧交换活性。在491°C下测量的表面交换系数(k)值在老化7天后从初始的4.4×10 cm s降至1.7×10 cm s。氧交换速率的快速下降伴随着X射线光电子能谱检测到的“非晶格锶”表面浓度的增加。随后40天的电化学测试表明，通过在去离子水中冲洗钝化电极可以恢复电极性能。重复处理最终也提高了电化学性能的稳定性。
