Electrical conducting properties of proton-conducting terbium-doped strontium cerate membrane

Qi, Xiwang; Lin, Jerry Y S

doi:10.1016/s0167-2738(99)00013-2

Cited by 60 publications

(21 citation statements)

References 28 publications

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“…Unfortunately, only a small amount of the available data can be reviewed here [14,15,[19][20][21][272][273][274][275][276][277][278][279][280][281][282][283][284][285][286][287]; additional information is available in Chapters 12 and 13. These materials are oxygen-deficient solid solutions, primarily of the families such as A 2 þ M 4 þ 1Àx R 3 þ x O 3Àx=2 and A 3 Ca 1 þ x Nb 2Àx O 9À3x/2 (A ¼ Ba, Sr, Ca; M ¼ Ce, Zr, Hf, Sn, Th; R ¼ Sc, Y, Ln, In).…”

Section: High-temperature Proton Conductors: Ceramic Oxidesmentioning

confidence: 99%

“…Usually, hole conduction becomes significant or even dominant at p(O 2 ) !1 Pa [273,274,276,277,282,284], but Pr-and Tb-doped cerates display several orders lower hole conductivities even in air [285,286], as the two Ln (3 þ ) are readily oxidized to Ln(4 þ ) and therefore act as traps for holes. In Figure 7.27 (graphs [13][14][15][16][17][18][19][20][21], only the conductivities in essentially ionic regimes are depicted, although these may still contain some oxide-ion contribution.…”

Section: High-temperature Proton Conductors: Ceramic Oxidesmentioning

confidence: 99%

See 1 more Smart Citation

Alkali Metal Cation and Proton Conductors: Relationships between Composition, Crystal Structure, and Properties

Avdeev¹,

Nalbandyan²,

Shukaev³

2009

Solid State Electrochemistry I

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The aim of this chapter is to provide an overview of materials where fast transport of alkali metal cations and protons is observed. A general discussion of factors affecting conductivity and techniques used to study ion migration paths is followed by a review of the large number of cation conductors. Materials with large alkali ions (Na-Cs) are often isostructural and therefore examined as a group. The lithium conductors with unique crystal structure types and proton conductors with unique conduction mechanisms are also discussed.

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Section: High-temperature Proton Conductors: Ceramic Oxidesmentioning

confidence: 99%

Section: High-temperature Proton Conductors: Ceramic Oxidesmentioning

confidence: 99%

Alkali Metal Cation and Proton Conductors: Relationships between Composition, Crystal Structure, and Properties

Avdeev¹,

Nalbandyan²,

Shukaev³

2009

Solid State Electrochemistry I

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“…The major problem with the SrCeO 3 based ceramic membranes is their low electronic conductivity that leads to low hydrogen permeability. Results obtained in our laboratory show that thulium (Tm) doped SrCeO 3 has much improved electronic conductivity and therefore higher hydrogen permeability [2,3]. For hydrogen permeation through proton-conducting ceramic membranes the bulk diffusion is more likely to be the rate-limiting step even for the thin membranes because the surface charge transfer reaction for hydrogen requires lower energy as compared to oxygen.…”

Section: Introductionmentioning

confidence: 96%

Proton-Conducting Dense Ceramic Membranes for Hydrogen Separation

Lin¹,

Cheng²,

Gupta³

2003

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Dense perovskite-type structured ceramic membranes, SrCe 0.95 Tm 0.05 O 3 (SCTm), of different thickness, were prepared by the dry-press method. Membrane thickness was varied from 3 mm to 150 µm. The hydrogen permeation flux was found to be inversely proportional to the thickness of the dense films, indicating that the bulk diffusion rather than the surface reaction played a dominant role in the H 2 transport through these dense membranes within the studied thickness range. Hydrogen permeation flux increases with increasing upstream hydrogen partial pressure and decreasing downstream hydrogen partial pressure. The activation energy for hydrogen permeation through the SCTm membrane is about 116 kJ/mol in 600-700 ºC and 16 kJ/mol in 750-950 ºC. This indicates a change in the electrical and protonic conduction mechanism at around 700 ºC. Pd-Cu thin films were synthesized with elemental palladium and copper targets by the sequential R.F. sputter deposition on porous substrates. Pd-Cu alloy films could be formed after proper annealing. The deposited Pd-Cu films were gas-tight. This result demonstrated the feasibility of obtaining an ultrathin SCTm film by the sequential sputter deposition of Sr, Ce and Tm metals followed by proper annealing and oxidation. Such ultrathin SCTm membranes will offer sufficiently high hydrogen permeance for practical applications.

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“…Effect of different dopants on electronic conductivity of these protonic conductors has been studied extensively by many researchers [7][8][9][10]. According to the hopping mechanism of electronic conduction in oxide ceramics [11], the electronic conductivity is inversely related to the ionization potential of Ce and dopants.…”

Section: Introductionmentioning

confidence: 99%

Proton-Conducting Dense Ceramic Membranes for Hydrogen Separation

Lin¹,

Gupta²,

Cheng³

2004

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Dense thin films of SrCe 0.95 Tm 0.05 O 3-δ (SCTm) with perovskite structure were prepared on porous alumina or SCTm substrates by the methods of (1) polymeric-gel casting and (2) drypressing. The polymeric-gel casting method includes preparation of mixed metal oxide gel and coating of the gel on a macroporous alumina support. Micrometer thick SCTm films of the perovskite structure can be obtained by the polymeric-gel casting method. However, the deposited films are not hermetic and it may require about 50 coatings in order to obtain gas-tight SCTm films by this method. Pd-Cu thin films were synthesized with elemental palladium and copper targets by the sequential R.F. sputter deposition on porous substrates. Pd-Cu alloy films could be formed after proper annealing. The deposited Pd-Cu films were gas-tight. This result demonstrated the feasibility of obtaining an ultrathin SCTm film by the sequential sputter deposition of Sr, Ce and Tm metals followed by proper annealing and oxidation. Such ultrathin SCTm membranes will offer sufficiently high hydrogen permeance for practical applications.Thin gas-tight SCTm membranes were synthesized on porous SCTm supports by the drypressing method. In this method, the green powder of SCTm was prepared by wet chemical method using metal nitrates as the precursors. Particle size of the powder was revealed to be a vital factor in determining the porosity and shrinkage of the sintered disks. Small particle size formed the dense film while large particle size produced porous substrates. The SCTm film thickness was varied from 1 mm to 0.15 mm by varying the amount of the target powder. A close match between the shrinkage of the substrate and the dense film led to the defect free-thin films. The selectivity of H 2 over He with these films was infinite. The chemical environment on each side of the membrane influenced the H 2 permeation flux as it had concurrent effects on the driving force and electronic/ionic conductivities. The H 2 permeation rates were found to be inversely proportional to the thickness of the dense film indicating that bulk diffusion rather than surface reaction played a dominant role in H 2 transport through these dense films within the studied thickness range (150 µm -1 mm).

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Electrical conducting properties of proton-conducting terbium-doped strontium cerate membrane

Cited by 60 publications

References 28 publications

Alkali Metal Cation and Proton Conductors: Relationships between Composition, Crystal Structure, and Properties

Alkali Metal Cation and Proton Conductors: Relationships between Composition, Crystal Structure, and Properties

Proton-Conducting Dense Ceramic Membranes for Hydrogen Separation

Proton-Conducting Dense Ceramic Membranes for Hydrogen Separation

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