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Considerable hydrogen permeation behavior through a dense Ce0.8Sm0.2O2-δ (SDC) asymmetric thick film

Journal Article


Abstract


  • Ce0.8Sm0.2O2-δ (SDC) is one of the state-of-the-art oxide ion conductors, exhibiting high conductivity, and is considered to be the most promising electrolyte material for low-temperature solid oxide fuel cells (SOFCs). In this work, proton conduction behavior was demonstrated in this well-known oxide ion conductor at high temperatures by performing hydrogen permeation test. Dense SDC films were deposited on porous NiO–SDC substrates by a dry-pressing technique followed by co-firing at 1400°C for 5 h. Hydrogen permeability of the asymmetric micron-scale thick SDC films was evaluated for the first time. The dependence of the hydrogen permeation flux on film thickness, operating temperature and hydrogen chemical gradient was investigated. It was found that bulk diffusion is the rate-limiting factor for hydrogen permeation through the SDC film. The proton conductivity of the SDC film was also estimated according to Wagner equation, and varied from 3.03 × 10−6 to 1.09 × 10−5 S cm−1 at 950°C with the feed gas ranging from 20% H2/N2 to 80% H2/N2.

UOW Authors


  •   Sun, Wenping
  •   Shi, Zhen (external author)
  •   Liu, Wei (external author)

Publication Date


  • 2013

Geographic Focus


Citation


  • Sun, W., Shi, Z. & Liu, W. (2013). Considerable hydrogen permeation behavior through a dense Ce0.8Sm0.2O2-δ (SDC) asymmetric thick film. Journal of the Electrochemical Society, 160 (6), F585-F590.

Scopus Eid


  • 2-s2.0-84875673042

Has Global Citation Frequency


Start Page


  • F585

End Page


  • F590

Volume


  • 160

Issue


  • 6

Place Of Publication


  • United States

Abstract


  • Ce0.8Sm0.2O2-δ (SDC) is one of the state-of-the-art oxide ion conductors, exhibiting high conductivity, and is considered to be the most promising electrolyte material for low-temperature solid oxide fuel cells (SOFCs). In this work, proton conduction behavior was demonstrated in this well-known oxide ion conductor at high temperatures by performing hydrogen permeation test. Dense SDC films were deposited on porous NiO–SDC substrates by a dry-pressing technique followed by co-firing at 1400°C for 5 h. Hydrogen permeability of the asymmetric micron-scale thick SDC films was evaluated for the first time. The dependence of the hydrogen permeation flux on film thickness, operating temperature and hydrogen chemical gradient was investigated. It was found that bulk diffusion is the rate-limiting factor for hydrogen permeation through the SDC film. The proton conductivity of the SDC film was also estimated according to Wagner equation, and varied from 3.03 × 10−6 to 1.09 × 10−5 S cm−1 at 950°C with the feed gas ranging from 20% H2/N2 to 80% H2/N2.

UOW Authors


  •   Sun, Wenping
  •   Shi, Zhen (external author)
  •   Liu, Wei (external author)

Publication Date


  • 2013

Geographic Focus


Citation


  • Sun, W., Shi, Z. & Liu, W. (2013). Considerable hydrogen permeation behavior through a dense Ce0.8Sm0.2O2-δ (SDC) asymmetric thick film. Journal of the Electrochemical Society, 160 (6), F585-F590.

Scopus Eid


  • 2-s2.0-84875673042

Has Global Citation Frequency


Start Page


  • F585

End Page


  • F590

Volume


  • 160

Issue


  • 6

Place Of Publication


  • United States