Abstract
Solid oxide fuel cells have been one of the most promising alternatives to fossil-fuel based energy in the past few years. One of the most important challenges is increasing the performance of mixed ionic-electronic conducting cathodes at lower temperatures. One such cathode which has been studied lately is based on the Ruddlesden-Popper phase La2NiO4 with Sr and Mn replacements on the A and B sites respectively. Using electrochemical impedance spectroscopy and distribution of relaxation time analysis this paper attempts to separate the different processes in such cathodes. Three different processes were identified with a low, medium, and high frequency. The three processes were related to three different processes respectively: oxygen diffusion, oxygen surface exchange and charge transfer, and finally oxygen transfer through the electrode/electrolyte interface.
Original language | English |
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Article number | 116109 |
Journal | Solid State Ionics |
Volume | 390 |
DOIs | |
State | Published - 1 Feb 2023 |
Keywords
- Cathode
- DRT
- EIS
- LNO
- Ruddlesden-Popper
- SOEC
- SOFC
ASJC Scopus subject areas
- General Chemistry
- General Materials Science
- Condensed Matter Physics