11. Chemical Diffusion and Hydrogen Separation Properties of Lanthenum Ferrite and Doped Ceria Composite Mixed Conductors

  1. Narottam P. Bansal
  1. Annamalai Karthikeyan,
  2. Hengdong Cui,
  3. Srikanth Gopalan and
  4. Uday B. Pal

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291245.ch11

Advances in Solid Oxide Fuel Cells: Ceramic Engineering and Science Proceedings, Volume 26, Number 4

Advances in Solid Oxide Fuel Cells: Ceramic Engineering and Science Proceedings, Volume 26, Number 4

How to Cite

Karthikeyan, A., Cui, H., Gopalan, S. and Pal, U. B. (2005) Chemical Diffusion and Hydrogen Separation Properties of Lanthenum Ferrite and Doped Ceria Composite Mixed Conductors, in Advances in Solid Oxide Fuel Cells: Ceramic Engineering and Science Proceedings, Volume 26, Number 4 (ed N. P. Bansal), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291245.ch11

Author Information

  1. Manufacturing Eng., Boston University, 15 Saint Mary's Street, Boston, MA 02215 USA

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2005

ISBN Information

Print ISBN: 9781574982343

Online ISBN: 9780470291245

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Keywords:

  • lanthanum;
  • oxide fuel cells;
  • gddoped ceria (GDC);
  • engelhard

Summary

A new method to separate hydrogen using dual phase composite mixed ionic and electronic conducting (MIEC) membranes has been proposed and is being currently investigated. In this approach methane or reformate comprising CO and H2: mixtures is fed to one side of the membrane, while steam is fed to the other side. Oxygen from the steam side of the membrane transports through coupled transport of oxygen ions and electrons across the membrane to the methane/reformate side resulting in a hydrogen rich product on the permeate side. This process requires MIEC materials that are stable, have significantly high surface exchange constant, and oxygen ion and electron conductivities at low oxygen partial pressures. Measurements made on MIECs such as strontium or calcium doped lanthanum cobalt iron oxides (LSCF and LCF) indicate that they are not stable. Transport properties, phase stability and surface exchange reaction rate measurements made on new dual phase membranes consisting of doped ceria and doped strontium titanate indicate that they are suitable for the permeation process.