Abstract
The transient response of SOFC oxygen cathodes shows a
characteristic inductive hysteresis and correspondingly the
impedance diagram combines one or two capacitive arcs with a low
frequency inductive arc. These features are discussed on the basis
of a three step reaction sequence taken from litterature. It is
argued that this kind of mechanism can only partly explain the
experimental observations. The capacitive part of the low
frequency response at anodic potentials is shown to be due to gas
enclosures at the lectrode-electrolyte interface. As to the
inductive activation mechanism of the reaction no explanation is
found. The analysis indicates that the phenomenon is caused by a
reaction which is not a step in the reaction sequence, but running
in parallel to the oxygen reaction,thus modifying the
electrocatalytic or transport properties of the
electrode-electrolyte interface.
Original language | English |
---|---|
Title of host publication | Proceedings th 17th Risoe Int. Symp. on Materials Science: High Temperature Electrochemistry: Ceramics and Metals. |
Place of Publication | Roskilde, Denmark |
Publisher | Risø National Laboratory |
Publication date | 1996 |
Pages | 29-40 |
Publication status | Published - 1996 |
Event | 17th Risoe International Symposium on Materials Science: High Temperature Electrochemistry: Ceramics and Metals. - Risoe, Roskilde, Denmark Duration: 2 Sept 1996 → 6 Sept 1996 |
Conference
Conference | 17th Risoe International Symposium on Materials Science |
---|---|
Location | Risoe |
Country/Territory | Denmark |
City | Roskilde |
Period | 02/09/1996 → 06/09/1996 |