The thickness dependence of oxygen permeability in sol-gel derived Ce o.8GdO.2O2-δ-CoFe2O 4 thin films on porous ceramic substrates: A sputtered "Blocking" Layer for thickness control

Kyle S. Brinkman, Takashi Iijima, Hitoshi Takamura

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

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 Ceo.8GdO.2O 2-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 (0.03 mol1cm2 s) at 800°C as compared to 1mm thick bulk ceramic membranes (0.003 imolIcm2).

Original languageEnglish
Title of host publicationMaterials Research Society Symposium Proceedings - Solid-State Ionics - 2008
Pages145-151
Number of pages7
Publication statusPublished - 2009 Sep 25
EventSolid-State Ionics 2008 - 2008 MRS Fall Meeting - Boston, MA, United States
Duration: 2008 Dec 12008 Dec 5

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1126
ISSN (Print)0272-9172

Other

OtherSolid-State Ionics 2008 - 2008 MRS Fall Meeting
CountryUnited States
CityBoston, MA
Period08/12/108/12/5

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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    Brinkman, K. S., Iijima, T., & Takamura, H. (2009). The thickness dependence of oxygen permeability in sol-gel derived Ce o.8GdO.2O2-δ-CoFe2O 4 thin films on porous ceramic substrates: A sputtered "Blocking" Layer for thickness control. In Materials Research Society Symposium Proceedings - Solid-State Ionics - 2008 (pp. 145-151). (Materials Research Society Symposium Proceedings; Vol. 1126).