High Ionic Conductivity in a LiFeO2–LiAlO2 Composite Under H2/Air Fuel Cell Conditions

Rong Lan, Shanwen Tao

    Research output: Contribution to journalArticle

    15 Citations (Scopus)

    Abstract

    New ionic conducting materials for electrolytes for electrochemical devices have been attracting the interest of researchers in energy materials. Here, for the first time, we report a conductive composite with high ionic conductivity derived from an electronic conductor α-LiFeO2 and an insulator γ-LiAlO2. High conductivity was observed in the α-LiFeO2–γ-LiAlO2 composite when prepared by a solid state reaction method. However, the conductivity enhancement in α-LiFeO2–γ-LiAlO2 composite was not observed when the two oxides were mechanically mixed. The α-LiFeO2–γ-LiAlO2 composite also exhibits O2− or/and H+ ionic conduction which was confirmed through H2/air fuel cell measurements. An exceptionally high conductivity of 0.50 S cm−1 at 650 °C was observed under H2/air fuel cell conditions. This provides a new approach to discover novel ionic conductors from composite materials derived from electronic conductors.
    Original languageEnglish
    Pages (from-to)1350-1358
    Number of pages9
    JournalChemistry-A European Journal
    Volume21
    Issue number3
    Early online date13 Nov 2014
    DOIs
    Publication statusPublished - 12 Jan 2015

    Keywords

    • composites
    • electrochemistry
    • electronic conductors
    • ionic conductor
    • oxygen ion conductor

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