A New Family of Proton-Conducting Conducting Materials in Layered Oxides

Shanwen Tao, Rong Lan

    Research output: Contribution to conferenceAbstract

    Abstract

    To identify a good ionic conducting material for use as electrolyte for intermediate temperature solid oxide fuel cells (IT-SOFCs) remains a big challenge. In this report, we demonstrate that good proton conductor can be obtained in transition element rich intercalation materials such as LixAl0.5Co0.5O2. OCV of 1.0 ~ 1.1V was observed for a H2/air fuel cell at temperature 475 – 575 °C indicating it is nearly a pure ionic conductor under fuel cell operating conditions. A power density of 173 mW cm-2 has been achieved at 525 °C with a thick electrolyte (0.79 mm thick) when silver was used as both cathode and anode. The ionic conductivity of LiAl0.5Co0.5O2 was 0.1 S/cm at 500 °C, deduced from the series resistance of the H2/air fuel cell. This is the highest among known poly-crystalline proton-conducting materials. This study will provide a new approach to discover new proton conducting materials for use in IT-SOFCs. It is expected that an ideal proton-conducting oxide may be identified in layered oxides.
    Original languageEnglish
    Publication statusPublished - 2014

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    Oxides
    Protons
    Fuel cells
    Solid oxide fuel cells (SOFC)
    Electrolytes
    Transition Elements
    Ionic conductivity
    Intercalation
    Air
    Silver
    Temperature
    Anodes
    Cathodes
    Crystalline materials

    Cite this

    A New Family of Proton-Conducting Conducting Materials in Layered Oxides. / Tao, Shanwen ; Lan, Rong.

    2014.

    Research output: Contribution to conferenceAbstract

    @conference{23153e9a33e14043a86fdc27607ad69c,
    title = "A New Family of Proton-Conducting Conducting Materials in Layered Oxides",
    abstract = "To identify a good ionic conducting material for use as electrolyte for intermediate temperature solid oxide fuel cells (IT-SOFCs) remains a big challenge. In this report, we demonstrate that good proton conductor can be obtained in transition element rich intercalation materials such as LixAl0.5Co0.5O2. OCV of 1.0 ~ 1.1V was observed for a H2/air fuel cell at temperature 475 – 575 °C indicating it is nearly a pure ionic conductor under fuel cell operating conditions. A power density of 173 mW cm-2 has been achieved at 525 °C with a thick electrolyte (0.79 mm thick) when silver was used as both cathode and anode. The ionic conductivity of LiAl0.5Co0.5O2 was 0.1 S/cm at 500 °C, deduced from the series resistance of the H2/air fuel cell. This is the highest among known poly-crystalline proton-conducting materials. This study will provide a new approach to discover new proton conducting materials for use in IT-SOFCs. It is expected that an ideal proton-conducting oxide may be identified in layered oxides.",
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    AU - Tao, Shanwen

    AU - Lan, Rong

    PY - 2014

    Y1 - 2014

    N2 - To identify a good ionic conducting material for use as electrolyte for intermediate temperature solid oxide fuel cells (IT-SOFCs) remains a big challenge. In this report, we demonstrate that good proton conductor can be obtained in transition element rich intercalation materials such as LixAl0.5Co0.5O2. OCV of 1.0 ~ 1.1V was observed for a H2/air fuel cell at temperature 475 – 575 °C indicating it is nearly a pure ionic conductor under fuel cell operating conditions. A power density of 173 mW cm-2 has been achieved at 525 °C with a thick electrolyte (0.79 mm thick) when silver was used as both cathode and anode. The ionic conductivity of LiAl0.5Co0.5O2 was 0.1 S/cm at 500 °C, deduced from the series resistance of the H2/air fuel cell. This is the highest among known poly-crystalline proton-conducting materials. This study will provide a new approach to discover new proton conducting materials for use in IT-SOFCs. It is expected that an ideal proton-conducting oxide may be identified in layered oxides.

    AB - To identify a good ionic conducting material for use as electrolyte for intermediate temperature solid oxide fuel cells (IT-SOFCs) remains a big challenge. In this report, we demonstrate that good proton conductor can be obtained in transition element rich intercalation materials such as LixAl0.5Co0.5O2. OCV of 1.0 ~ 1.1V was observed for a H2/air fuel cell at temperature 475 – 575 °C indicating it is nearly a pure ionic conductor under fuel cell operating conditions. A power density of 173 mW cm-2 has been achieved at 525 °C with a thick electrolyte (0.79 mm thick) when silver was used as both cathode and anode. The ionic conductivity of LiAl0.5Co0.5O2 was 0.1 S/cm at 500 °C, deduced from the series resistance of the H2/air fuel cell. This is the highest among known poly-crystalline proton-conducting materials. This study will provide a new approach to discover new proton conducting materials for use in IT-SOFCs. It is expected that an ideal proton-conducting oxide may be identified in layered oxides.

    UR - http://ma.ecsdl.org/content/MA2014-02/20/1007.abstract

    M3 - Abstract

    ER -