Development of passive hydrogen separation membranes made from Co-synthesized nanoscale cermet powders

John S. Hardy, Edwin C. Thomsen, Nathan L. Canfield, Jarrod V. Crum, K. Scott Weil, Larry R. Pederson

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    14 Citations (Scopus)

    Abstract

    A powder comprised of nickel oxide and proton-conducting Nd- and Zr-doped barium cerate with a particle size on the order of 10 nm has been co-synthesized using the glycine-nitrate combustion process. The two compositions are intimately mixed with no significant elemental substitution between them after synthesis. To ensure complete reaction of the cerate components, the synthesized powder must be calcined at 1000 {ring operator} C. Among the barium cerate compositions investigated, the 30% Zr- and 15% Nd-doped material exhibited the best combination of chemical stability in CO2 and conductivity in hydrogen environments. At least 35 vol% Ni is required to achieve percolation in the composites. When sintering is carried out in an atmosphere which promotes reduction of nickel oxide to nickel metal, the result is a mixed electronic- and protonic-conducting composite which has potential use as a hydrogen separation membrane. Composites with a relative density of 99.2% and nanoscale grains have been prepared by hot pressing.

    Original languageEnglish
    Pages (from-to)3631-3639
    Number of pages9
    JournalInternational Journal of Hydrogen Energy
    Volume32
    Issue number16
    DOIs
    Publication statusPublished - 1 Nov 2007

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    Keywords

    • Cerate
    • Cermet
    • Composite
    • Gas separation
    • Hydrogen
    • Ionic conduction
    • Membrane
    • Nanoscale
    • Nickel
    • Percolation
    • Proton
    • Synthesis

    ASJC Scopus subject areas

    • Renewable Energy, Sustainability and the Environment
    • Fuel Technology
    • Condensed Matter Physics
    • Energy Engineering and Power Technology

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