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@ARTICLE{Escolastico:20898,
      author       = {Escolastico, S. and Ivanova, M. and Solis, C. and Roitsch,
                      S. and Meulenberg, W.A. and Serra, J.M.},
      title        = {{I}mprovement of transport properties and hydrogen
                      permeation of chemically-stable proton-conducting oxides
                      based on the system {B}a{Z}r1-x-y{Y}x{M}y{O}3-delta},
      journal      = {RSC Advances},
      volume       = {2},
      issn         = {2046-2069},
      address      = {London},
      publisher    = {RSC Publishing},
      reportid     = {PreJuSER-20898},
      pages        = {4932 - 4943},
      year         = {2012},
      note         = {Financial support by the Spanish Ministry for Economics and
                      Competitiveness (JAE-Pre 08-0058, ENE2008-06302 and
                      ENE2011-24761 grants) and the Helmholtz Association of
                      German Research Centers through the Helmholtz Alliance
                      MEM-BRAIN (Initiative and Networking Fund) is kindly
                      acknowledged. Dr M. Ivanova thanks the Northern European
                      Innovative Energy Research Program N-INNER (grant no.
                      09-064274) and the German Federal Ministry of Education and
                      Research (BMBF) for supporting the N-INNER Project "Novel
                      High Temperature Proton and Mixed-Proton Electron Conductors
                      for Fuel Cells and H<INF>2</INF>-separation membranes''
                      (Contract 03SF0330).},
      abstract     = {The structural and transport properties as well as the
                      chemical stability of a series of proton-conducting oxides
                      based on yttrium-doped barium zirconate were investigated.
                      Specifically, Pr-, Fe- and Mn-doped BaZr1-x-yYxMyO3-delta
                      compounds were prepared by solid state reaction. The
                      compound exhibiting the highest total and protonic
                      conductivity at elevated temperatures under reducing
                      atmospheres was BaZr0.8Y0.15Mn0.05O3-delta.
                      Temperature-programmed reduction experiments revealed a
                      particular redox behavior related to the Mn-species under
                      selected conditions. The hydrogen permeation was thoroughly
                      studied as a function of the temperature, hydrogen
                      concentration and the humidification degree in the sweep
                      gas. Moreover, the transient processes induced by alternate
                      step changes in the humidification degree of the sweep gas
                      were analysed. The highest steady hydrogen evolution flow
                      exceeded 0.03 ml min(-1) cm(-2) (0.9 mm-thick membrane) at
                      1000 degrees C for the humidified sweep gas. The stability
                      of BaZr0.8Y0.15M0.05O3-delta under operation-relevant
                      atmospheres (CO2-rich reducing atmosphere at high
                      temperature) was tested using different techniques ( X-ray
                      diffraction (XRD), Raman, SEM, TEM and TG) and the results
                      showed that this material is stable even when exposed to 115
                      ppm H2S.},
      keywords     = {J (WoSType)},
      cin          = {IEK-1},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {Rationelle Energieumwandlung},
      pid          = {G:(DE-Juel1)FUEK402},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000304148400054},
      doi          = {10.1039/c2ra20214j},
      url          = {https://juser.fz-juelich.de/record/20898},
}