| Autor: |
Md Saiful ALAM, Isao KAGOMIYA, Ken-ichi KAKIMOTO |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
Electrochemistry, Vol 91, Iss 3, Pp 037003-037003 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
2186-2451 |
| DOI: |
10.5796/electrochemistry.22-00128 |
| Popis: |
Perovskite oxides obtained from Ba1−xLaxFeO3−δ (BLF) are considered beneficial materials for electrodes of solid oxide fuel cells and oxygen permeation membranes because of their high oxygen permeability, which is a criterion of oxide ion (O2−)-electronic mixed conductivity. In this paper, the prime focus was to understand the oxygen permeation mechanism through surface exchange and bulk diffusion of the Ba0.5La0.5FeO3−δ (BLF55) sample. The permeated oxygen flux displayed higher than that of the typical mixed conductor La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF), which was explored simultaneously with corresponding oxygen chemical potentials employing an especial experimental setup. This study found that the surface exchange reaction on the oxygen-lean side was the rate-determining step (RDS) of the oxygen permeation below 800 °C, resulting from lower hole concentration on the oxygen-lean side surface. Enhancing the charge transfer from the surface oxygen by increasing hole concentration is a prime important strategy to improve the surface exchange reaction. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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