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Electrical and Hydrogen Transport Properties of SrCe0.8Yb0.2O3−δ/Ni Cermet Membranes

Published online by Cambridge University Press:  01 February 2011

S.-J. Song ,
T. H. Lee ,
L. Chen ,
C. Zuo ,
S. E. Dorris  and
U. Balachandran
S.-J. Song
Affiliation:
Energy Technology Division, Argonne National Laboratory, Argonne, IL 60439
T. H. Lee
Affiliation:
Energy Technology Division, Argonne National Laboratory, Argonne, IL 60439
L. Chen
Affiliation:
Energy Technology Division, Argonne National Laboratory, Argonne, IL 60439
C. Zuo
Affiliation:
Energy Technology Division, Argonne National Laboratory, Argonne, IL 60439
S. E. Dorris
Affiliation:
Energy Technology Division, Argonne National Laboratory, Argonne, IL 60439
U. Balachandran
Affiliation:
Energy Technology Division, Argonne National Laboratory, Argonne, IL 60439
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Abstract

Research on hydrogen separation membranes is motivated by the increasing demand for an environmentally benign, inexpensive technology for separating hydrogen from gas mixtures. Although most studies of hydrogen separation membranes have focused on proton-conducting oxides by themselves, the addition of metal to these oxides increases their hydrogen permeability and improves their mechanical stability. This study began by determining the electrical and hydrogen permeation properties of SrCe0.8Yb0.2O3−δ (SCYb). The results showed that the hydrogen permeation rate is limited by electron flow at the investigated temperatures (600 – 900°C). To further enhance hydrogen permeability, a cermet (i.e., ceramic-metal composite) membrane was made by adding Ni to the SCYb. The cermet showed no phase change after sintering in a reducing atmosphere. At 900°C, with 20% H2 /balance He as a feed gas (pH2O = 0.03 atm), the hydrogen permeation rate was 0.113 cm3/min-cm2 for Ni/SCYb (0.43-mm thick) and 0.008 cm3/min-cm2 for SCYb (0.7-mm thick). The dependences of hydrogen permeability on temperature, thickness, and hydrogen partial pressure gradients are also determined. The results demonstrate that adding Ni to SCYb considerably increases its hydrogen permeability by increasing its electron conductivity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 835: Symposium K – Solid-State Ionics , 2004 , K3.2
Copyright
Copyright © Materials Research Society 2005

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References

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