Sökning: "Protonic conductivity"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden Protonic conductivity.

  1. 1. Proton conductivity in acceptor-doped lanthanide based pyrochlore oxides

    Detta är en avhandling från Göteborg : Chalmers University of Technology

    Författare :Karinh Eurenius; Göteborgs universitet.; Gothenburg University.; [2009]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Pyrochlore; Rietveld refinement; Proton conductivity; Electrical impedance spectroscopy; Concentration Cell Electromotive Force Method.;

    Sammanfattning : A high interest in developing new materials for SOFC applications in the temperature range of approximately 200–500 C has been growing lately. The lower activation energies for proton (H+) mobility can give higher conductivity in this temperature range. LÄS MER

  2. 2. Functional Oxide Materials exhibiting Ionic Conductivity for Future Energy Conversion Needs

    Detta är en avhandling från Chalmers University of Technology

    Författare :Francis G. Kinyanjui; Chalmers tekniska högskola.; Chalmers University of Technology.; [2013]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; proton conduction; perovskites; oxygen deficient perovskites; neutron diffraction; in-situ cells; Rietveld refinements; deuteron position; BaSnO3; BaZrO3; Ba3In2ZrO8;

    Sammanfattning : Fuel cells are electrochemical devices that transform the chemical energy in hydrogen and oxygen into electrical energy at high efficiencies and produce only water vapour emissions. Materials with the perovskite or fluorite structure types are commonly employed as the ion conducting ceramic electrolyte membranes in intermediate and high temperature fuel cells. LÄS MER

  3. 3. Intermediate Temperature Solid Ionic Conductors and Fuel Cells

    Detta är en avhandling från Chalmers University of Technology

    Författare :Zhu Bin; Chalmers tekniska högskola.; Chalmers University of Technology.; [1995]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Teknisk materialvetenskap; Materials science; intermediate temperature; oxyacid salts; molten phase; salt-ceramic composites; ionic and protonic conduction and diffusion; bulk and interfacial conduction; blocked and non-blocked mobile species; solid state proton conductors and fuel cells;

    Sammanfattning : Novel solid proton conductors based on oxyacid salts and salt-ceramic composites and intermediate temperature fuel cells have been developed in this thesis work. The discovery of proton conduction in these materials introduces a new concept of proton conductors and starts a new research field - Intermediate Temperature Solid Proton Conductors and Fuel Cells. LÄS MER

  4. 4. Exploratory Study of Novel Materials Used for Intermediate Temperature Solid Oxide Fuel Cell (IT-SOFC) Electrolytes

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Junfu Bu; KTH.; [2014]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hafnium oxide; Solid oxide fuel cells SOFCs ; Electrolyte; Electrochemical impedance spectroscopy; Solid state reaction method; Solid state reactive sintering SSRS ; Ionic conductivity; oxygen ion conductivity; Protonic conductivity; Composite electrolyte.;

    Sammanfattning : Currently, yttria-stabilized zirconia (YSZ) is still the dominant electrolyte material in commercial SOFC applications. But it has severe drawbacks due to its high operating temperatures. In present work, two electrolyte materials: Hf0.69Y0. LÄS MER

  5. 5. Proton Conducting Ceramics; Synthesis, Characterization and Sample Cell Environments

    Detta är en avhandling från Chalmers University of Technology

    Författare :Francis G. Kinyanjui; Chalmers tekniska högskola.; Chalmers University of Technology.; [2012]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fasta tillståndets kemi; Solid state chemistry; Övrig teknisk materialvetenskap; Other materials science; proton conduction; perovskites; neutron diffraction; in-situ cell; Rietveld refinements; deuteron position; BaSnO3; BaZrO3;

    Sammanfattning : Acceptor doped Perovskite ceramics have been shown to exhibit high levels of protonic conduction in humid atmospheres. However significant grain boundary resistance and long sintering times required to achieve sufficient grain size growth has hindered their widespread application as electrolyzers, fuel cells and gas separation membranes. LÄS MER