Changes In LSC and LSCF Cathode Crystallographic Parameters Measured by Electrochemical In Situ High-Temperature XRD
| DOI | 10.1149/05701.1841ecst |
|---|---|
| Year | 2013 |
| Publisher | The Electrochemical Society |
| Journal | ECS Transactions |
| Volume | 57 |
| Number | 1 |
| Pages | 1841-1849 |
| Type | article in journal |
| Estonian author | |
| Language | English |
| Id | 24624 |
Abstract
The solid oxide fuel cell symmetrical cells with porous cathodes for intermediate temperature applications have been studied under electrochemical polarization and oxygen feeding conditions using high-temperature in situ XRD (HT-XRD) method. Changes in the lattice parameters of La0.6Sr 0.4CoO3-δ and La0.6Sr 0.4Co0.2Fe0.8O3-δ were observed depending on the temperature (T), electrode potential (E) and oxygen partial pressure (pO2) applied. At fixed T and pO2, the cathode potential noticeably influences the crystallographic cell volume, thus, i.e., the oxygen stoichiometry, explained by the partial reduction of electrochemically labile Coionic centers in La0.6Sr0.4CoO3 - δ (LSC) and the La0.6Sr0.4Co0.2Fe 0.8O3 -δ (LSCF) under study. Noticeably higher effect of cathode potential on the cell volume has been established at lower pO2.