New Hypothesis for SOFC Ceramic Oxygen Electrode Mechanisms

Mogens Bjerg Mogensen, Christodoulos Chatzichristodoulou, Christopher R. Graves, Karin Vels Hansen, Kent Kammer Hansen, Anne Hauch, Torben Krogsdal Jacobsen, Kion Norrman

Research output: Contribution to journalConference articleResearchpeer-review


A new hypothesis for the electrochemical reaction mechanism in solid oxide cell ceramic oxygen electrodes is proposed based on literature including our own results. The hypothesis postulates that the observed thin layers of SrO-La2O3 on top of ceramic perovskite and other Ruddlesden-Popper structured electrode materials are sufficiently electron and oxygen ion conducting to provide reaction sites despite that the bulk phase of such an oxide layer is insulating. We claim that a few nanometer thin layer of mixed SrO-La2O3 that contains some dissolved transition metal and some impurities plus two space charge layers – one towards the gas phase and the other towards the perovskite – will be sufficiently oxide ion (vacancy) and electron conducting to support the electrode process. We also present some considerations about a possible mechanism of improved electrodes.
Original languageEnglish
JournalE C S Transactions
Issue number7
Pages (from-to)93-103
Number of pages11
Publication statusPublished - 2016
EventThe 229th ECS Meeting - San Diego, United States
Duration: 29 May 20162 Jun 2016
Conference number: 229


ConferenceThe 229th ECS Meeting
Country/TerritoryUnited States
CitySan Diego
Internet address


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