New hypothesis for SOFC ceramic oxygen electrode mechanisms

Mogens Bjerg Mogensen; Christodoulos Chatzichristodoulou; Christopher Graves; Karin Vels Hansen; Kent Kammer Hansen; Anne Hauch; Torben Jacobsen; Kion Norrman

doi:10.1149/07207.0093ecst

New hypothesis for SOFC ceramic oxygen electrode mechanisms

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

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

5 Scopus citations

Abstract

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 language	English
Title of host publication	Ionic and Mixed Conducting Ceramics 10
Editors	M. B. Mogensen, T. Kawada, T. M. Gur, X. D. Zhou, A. Manivannan
Publisher	Electrochemical Society Inc.
Pages	93-103
Number of pages	11
Edition	7
ISBN (Electronic)	9781607687177
DOIs	https://doi.org/10.1149/07207.0093ecst
State	Published - 2016
Externally published	Yes

Publication series

Name	ECS Transactions
Number	7
Volume	72
ISSN (Print)	1938-6737
ISSN (Electronic)	1938-5862

Bibliographical note

Publisher Copyright:
©The Electrochemical Society.

ASJC Scopus subject areas

General Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1149/07207.0093ecst

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Mogensen, M. B., Chatzichristodoulou, C., Graves, C., Hansen, K. V., Hansen, K. K., Hauch, A., Jacobsen, T., & Norrman, K. (2016). New hypothesis for SOFC ceramic oxygen electrode mechanisms. In M. B. Mogensen, T. Kawada, T. M. Gur, X. D. Zhou, & A. Manivannan (Eds.), Ionic and Mixed Conducting Ceramics 10 (7 ed., pp. 93-103). (ECS Transactions; Vol. 72, No. 7). Electrochemical Society Inc.. https://doi.org/10.1149/07207.0093ecst

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title = "New hypothesis for SOFC ceramic oxygen electrode mechanisms",

abstract = "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.",

author = "Mogensen, \{Mogens Bjerg\} and Christodoulos Chatzichristodoulou and Christopher Graves and Hansen, \{Karin Vels\} and Hansen, \{Kent Kammer\} and Anne Hauch and Torben Jacobsen and Kion Norrman",

note = "Publisher Copyright: {\textcopyright}The Electrochemical Society.",

year = "2016",

doi = "10.1149/07207.0093ecst",

language = "English",

series = "ECS Transactions",

publisher = "Electrochemical Society Inc.",

number = "7",

pages = "93--103",

editor = "Mogensen, \{M. B.\} and T. Kawada and Gur, \{T. M.\} and Zhou, \{X. D.\} and A. Manivannan",

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}

Mogensen, MB, Chatzichristodoulou, C, Graves, C, Hansen, KV, Hansen, KK, Hauch, A, Jacobsen, T & Norrman, K 2016, New hypothesis for SOFC ceramic oxygen electrode mechanisms. in MB Mogensen, T Kawada, TM Gur, XD Zhou & A Manivannan (eds), Ionic and Mixed Conducting Ceramics 10. 7 edn, ECS Transactions, no. 7, vol. 72, Electrochemical Society Inc., pp. 93-103. https://doi.org/10.1149/07207.0093ecst

New hypothesis for SOFC ceramic oxygen electrode mechanisms. / Mogensen, Mogens Bjerg; Chatzichristodoulou, Christodoulos; Graves, Christopher et al.
Ionic and Mixed Conducting Ceramics 10. ed. / M. B. Mogensen; T. Kawada; T. M. Gur; X. D. Zhou; A. Manivannan. 7. ed. Electrochemical Society Inc., 2016. p. 93-103 (ECS Transactions; Vol. 72, No. 7).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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N2 - 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.

AB - 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.

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New hypothesis for SOFC ceramic oxygen electrode mechanisms

Abstract

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