title: Investigation of La1-xSrxCrO3-∂ (x ~ 0.1) as Membrane for Hydrogen Production.
abstract: Various inorganic membranes have demonstrated good capability to separate hydrogen from other gases at elevated temperatures. Hydrogen-permeable, dense, mixed proton-electron conducting ceramic oxides offer superior selectivity and thermal stability, but chemically robust candidates with higher ambipolar protonic and electronic conductivity are needed. In this work, we present for the first time the results of various investigations of La1-xSrxCrO3-∂ membranes for hydrogen production. We aim in particular to elucidate the material's complex transport properties, involving co-ionic transport of oxide ions and protons, in addition to electron holes. This opens some new possibilities for efficient heat and mass transfer management in the production of hydrogen. Conductivity measurements as a function of pH2 at constant pO2 exhibit changes that reveal a significant hydration and presence of protons. The flux and production of hydrogen have been measured under different chemical gradients. In particular, the effect of water vapor in the feed and permeate gas stream sides was investigated with the aim of quantifying the ratio of hydrogen production by hydrogen flux from feed to permeate and oxygen flux the opposite way ("water splitting"). Deuterium labeling was used to unambiguously prove flux of hydrogen species.
authors: SINTEF Materials and Chemistry, P.O. Box 124 Blindern, Oslo NO-0314, Norway. yngve.larring@sintef.no.
authors: Yngve
authors: Y
authors: Larring
authors: Centre for Materials Science and Nanotechnology, Department of Chemistry, University of Oslo, FERMiO, Gaustadalleen 21, Oslo NO-0349, Norway. camilla.vigen@smn.uio.no.
authors: Camilla
authors: C
authors: Vigen
authors: SINTEF Materials and Chemistry, P.O. Box 124 Blindern, Oslo NO-0314, Norway. florian.ahouanto@sintef.no.
authors: Florian
authors: F
authors: Ahouanto
authors: SINTEF Materials and Chemistry, P.O. Box 124 Blindern, Oslo NO-0314, Norway. marie-laure.fontaine@sintef.no.
authors: Marie-Laure
authors: ML
authors: Fontaine
authors: SINTEF Materials and Chemistry, P.O. Box 124 Blindern, Oslo NO-0314, Norway. thijs.peters@sintef.no.
authors: Thijs
authors: T
authors: Peters
authors: Statoil, Forskningsparken, Porsgrunn NO-3908, Norway. jbsm@statoil.com.
authors: Jens B
authors: JB
authors: Smith
authors: Centre for Materials Science and Nanotechnology, Department of Chemistry, University of Oslo, FERMiO, Gaustadalleen 21, Oslo NO-0349, Norway. truls.norby@kjemi.uio.no.
authors: Truls
authors: T
authors: Norby
authors: SINTEF Materials and Chemistry, P.O. Box 124 Blindern, Oslo NO-0314, Norway. rune.bredesen@sintef.no.
authors: Rune
authors: R
authors: Bredesen