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Investigation of La1−xSrxCrO3−∂ (x ~ 0.1) as Membrane for Hydrogen Production
SINTEF Materials and Chemistry, P.O. Box 124 Blindern, Oslo NO-0314, Norway
Centre for Materials Science and Nanotechnology, Department of Chemistry, University of Oslo, FERMiO, Gaustadalleen 21, Oslo NO-0349, Norway
Statoil, Forskningsparken, Porsgrunn NO-3908, Norway
* Author to whom correspondence should be addressed.
Received: 1 August 2012; in revised form: 24 August 2012 / Accepted: 28 August 2012 / Published: 11 September 2012
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.
Keywords: hydrogen transport membrane; proton permeation; oxygen permeation; water splitting
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Larring, Y.; Vigen, C.; Ahouanto, F.; Fontaine, M.-L.; Peters, T.; Smith, J.B.; Norby, T.; Bredesen, R. Investigation of La1−xSrxCrO3−∂ (x ~ 0.1) as Membrane for Hydrogen Production. Membranes 2012, 2, 665-686.
Larring Y, Vigen C, Ahouanto F, Fontaine M-L, Peters T, Smith JB, Norby T, Bredesen R. Investigation of La1−xSrxCrO3−∂ (x ~ 0.1) as Membrane for Hydrogen Production. Membranes. 2012; 2(3):665-686.
Larring, Yngve; Vigen, Camilla; Ahouanto, Florian; Fontaine, Marie-Laure; Peters, Thijs; Smith, Jens B.; Norby, Truls; Bredesen, Rune. 2012. "Investigation of La1−xSrxCrO3−∂ (x ~ 0.1) as Membrane for Hydrogen Production." Membranes 2, no. 3: 665-686.