Nanocrystalline cathode functional layer for SOFC

作者：Chrzan Aleksander^*; Karczewski Jakub; Szymczewska Dagmara; Jasinski Piotr

来源：Electrochimica Acta, 2017, 225: 168-174.

DOI：10.1016/j.electacta.2016.12.128

• SOFC
• cathode functional layer
• thin film
• electrochemical impedance spectroscopy
• analysis of the difference in impedance spectra (ADIS)

Recently, it was shown that thin functional layers introduced between an electrolyte and cathode might improve cathode performance. However, the mechanism of this improvement still needs analysis. In this paper, a thin (similar to 140 nm), spin-coated perovskite layer (La0.6Sr0.4Co0.2Fe0.8O3-delta) was placed between a cathode (La0.6Sr0.4Co0.2Fe0.8O3-delta) and an electrolyte (Ce0.8Gd0.2O2-delta) and the effects of this investigated. The microstructure of this layer was varied in order to determine its impact on the electrical and electrochemical properties. It has been shown that a mesoporous, nanocrystalline layer increases the active area for oxygen reduction and charge transfer through the cathode/electrolyte interface, which improves performance. Moreover, the stability of the cathode from thermal stresses is increased. In contrast, the coarsening of the grain and the layer densification has a reduced impact on the cathode performance.

• 出版日期2017-1-20