Hydrostatic pressure decreases the proton mobility in the hydrated BaZr0.9Y0.1O3 proton conductor

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  • Qianli Chen
    Empa 1 Laboratory for High Performance Ceramics, Swiss Federal Laboratories for Materials Science and Technology, , CH-8600 Dübendorf, Switzerland
  • Artur Braun
    Empa 1 Laboratory for High Performance Ceramics, Swiss Federal Laboratories for Materials Science and Technology, , CH-8600 Dübendorf, Switzerland
  • Alejandro Ovalle
    Empa 1 Laboratory for High Performance Ceramics, Swiss Federal Laboratories for Materials Science and Technology, , CH-8600 Dübendorf, Switzerland
  • Cristian-Daniel Savaniu
    University of St. Andrews 3 School of Chemistry, , St Andrews, Fife, KY16 8DA Scotland, United Kingdom
  • Thomas Graule
    Empa 1 Laboratory for High Performance Ceramics, Swiss Federal Laboratories for Materials Science and Technology, , CH-8600 Dübendorf, Switzerland
  • Nikolai Bagdassarov
    J. W. Goethe Universität Frankfurt am Main 5 Institut for Geosciences, , D-60323 Frankfurt/Main, Germany

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<jats:p>Impedance spectroscopy on the hydrated proton conductor BaZr0.9Y0.1O3 at high temperatures shows that the bulk proton conductivity activation energy Eb scales with the strain parameter ε, as achieved by hydrostatic pressures up to 2 GPa, suggesting that large lattices favor proton diffusivity. At high temperature, Eb increases upon pressure by 40%. The grain boundary activation energy Eg is around twice as Eb, indicating higher proton mobility in grain boundaries as a result of pressure induced sintering. An expanded lattice with strain parameter ε&gt;1 should have lower Eb, suggesting that thin films expansive tensile strain could have larger proton conductivity.</jats:p>

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