Hostname: page-component-cd9895bd7-fscjk Total loading time: 0 Render date: 2025-01-01T07:58:23.438Z Has data issue: false hasContentIssue false
  • English
  • Français

The Thickness Dependence of Oxygen Permeability in Sol-Gel Derived Ce0.8Gd0.2O2-δ-CoFe2O4 Thin Films on Porous Ceramic Substrates: A Sputtered “Blocking Layer” for Thickness Control

Published online by Cambridge University Press:  01 February 2011

Kyle S. Brinkman ,
Takashi Iijima  and
Hitoshi Takamura
Kyle S. Brinkman
Affiliation:
kyle.brinkman@srnl.doe.gov, Savannah River National Laboratory (SRNL), Materials Science and Technology Directorate, Aiken, South Carolina, United States
Takashi Iijima
Affiliation:
iijima-t@aist.go.jp, National Institute of Advanced Industrial Science and Technology (AIST), Research Center for Hydrogen Industrial Use and Strage, Tsukuba, Ibaraki, Japan
Hitoshi Takamura
Affiliation:
takamura@material.tohoku.ac.jp, Tohoku University, Department of Materials Science, Sendai, Japan
Get access

Abstract

Mixed conductive oxides are a topic of interest for applications in oxygen separation membranes as well as use in producing hydrogen fuel through the partial oxidation of methane. The oxygen flux through the membranes is governed both by the oxygen ionic conductivity as well as the material's electronic conductivity; composite membranes like Ce0.8Gd0.2O2-δ(CGO)-CoFe2O4 (CFO) use gadolinium doped ceria oxides as the ionic conducting material combined with cobalt iron spinel which serves as the electronic conductor. In this study we employ ˜ 50 nm sputtered CeO2 layers on the surface of porous CGO ceramic substrates which serve as solution ‘blocking’ layers during the thin film fabrication process facilitating the control of film thickness. Films with thickness of ˜ 2 and 4 microns were prepared by depositing 40 and 95 separate sol-gel layers respectively. Oxygen flux measurements indicated that the permeation increased with decreasing membrane thickness; thin film membrane with thickness on the micron level showed flux values an order of magnitude greater (0.03μmol/cm2 s) at 800oC as compared to 1mm thick bulk ceramic membranes (0.003 μmol/cm2).

Keywords

thin filmnanoscaleionic conductor
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1126: Symposium S – Solid-State Ionics–2008 , 2008 , 1126-S13-04
Copyright
Copyright © Materials Research Society 2009

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Liu, Y.Y., Tan, X.Y., and Li, K., Mixed conducting ceramics for catalytic membrane processing. Catalysis Reviews-Science and Engineering, 2006. 48(2): p. 145–198.Google Scholar
2. Poulidi, D., Anderson, C., and Metcalfe, I.S., Remote control of the activity of a Pt catalyst supported on a mixed ionic electronic conducting membrane. Solid State Ionics, 2008. 179(27–32): p. 1347–1350.Google Scholar
3. Dyer, P.N., et al., Ion transport membrane technology for oxygen separation and syngas production. Solid State Ionics, 2000. 134(1–2): p. 21–33.Google Scholar
4. Kagomiya, I., et al., Oxygen permeable Ce0.8Gd0.2O1.9-CoFe2O4 thin films prepared on porous Ce0.8Gd0.2O1.9 substrates. Electrochemical and Solid State Letters, 2005. 8(1): p. A70-A73.Google Scholar
5. Kagomiya, I., Iijima, T., and Takamura, H., Oxygen permeability of nanocrystalline Ce0.8Gd0.2O1.9-CoFe2O4 mixed-conductive films. Journal of Membrane Science, 2006. 286(1–2): p. 180–184.Google Scholar
6. Cheng, S.G., Gupta, V.K., and Lin, J.Y.S., Synthesis and hydrogen permeation properties of asymmetric proton-conducting ceramic membranes. Solid State Ionics, 2005. 176(35–36): p. 2653–2662.Google Scholar
7. Wagner, C., Z. Phys. Chem. B, 1933. 21: p. 25.Google Scholar
8. Chen, C.H., et al., Oxygen permeation of La0.3Sr0.7CoO3-delta. Solid State Ionics, 1997. 98(1–2): p. 7–13.Google Scholar
9. Takamura, H., et al., Oxygen permeation properties of ceria-ferrite-based composites. Journal of Electroceramics, 2004. 13(1–3): p. 613–618.Google Scholar
10. Takamura, H., et al., Oxygen permeation and methane reforming properties of ceria-based composite membranes. Journal of Alloys and Compounds, 2006. 408: p. 1084–1089.Google Scholar