High temperature type protonic conductor based on SrCeO3 and its application to the extraction of hydrogen gas

Iwahara, Hiroyasu; Esaka, Takao; Uchida, Hiroyuki; Yamauchi, Takahira; Ogaki, K.

doi:10.1016/0167-2738(86)90299-7

Cited by 112 publications

(53 citation statements)

References 5 publications

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“…which exhibit proton conductivities in excess of 0.01 S cm -1 [51][52][53][54][55] and strontium-based ones (SrCeO 3 ) with somewhat lower conductivities. Both BaCeO 3 and BaZrO 3 are almost pure ionic conductors, and the electronic conductivity would, as such, rate limit the H 2 flux across membranes of these materials [56].…”

Section: Mixed Proton-electron Conducting Oxidesmentioning

confidence: 99%

Dense Ceramic Membranes for Hydrogen Separation

Norby

Haugsrud

2007

Membranes for Energy Conversion

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Section: Mixed Proton-electron Conducting Oxidesmentioning

confidence: 99%

Dense Ceramic Membranes for Hydrogen Separation

Norby

Haugsrud

2007

Membranes for Energy Conversion

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“…On the other hand, a number of inorganic solids such as BaCeO 3 , 4 Ba 3 Ca 1.18 Nb 1.82 O 9-δ (BCN18), 5,6 and CsH 2 PO 4 7 are known to have appreciable proton conductivity at temperatures between 250 and 600°C. 4,6 Layered solid acids such as R-Zr-(HPO 4 ) 2 ‚H 2 O, 8 which retain intercalated water molecules, can have appreciable protonic conductivity at even lower temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…4,6 Layered solid acids such as R-Zr-(HPO 4 ) 2 ‚H 2 O, 8 which retain intercalated water molecules, can have appreciable protonic conductivity at even lower temperatures. In these materials, the layers act as conduction channels for protons and water.…”

Section: Introductionmentioning

confidence: 99%

Structural Effects in the Protonic/Electronic Conductivity of Dion-Jacobson Phase Niobate and Tantalate Layered Perovskites

2007

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The layered Dion-Jacobson phase perovskites HLaTa 2 O 7 ‚xH 2 O, HLaNb 2 O 7 ‚0.5H 2 O and structural variants of HLaNb 2 O 7 ‚0.5H 2 O were prepared and their AC and DC conductivities were measured as a function of temperature and atmosphere. The layered structure in HLaNb 2 O 7 ‚0.5H 2 O was modified by pillaring, exfoliationrestacking, and further annealing. Exfoliation followed by restacking markedly increased the ionic conductivity, either by creation of mesopores for hydration or by enhanced contact between layers, but pillaring had little effect. HLaNb 2 O 7 ‚0.5H 2 O was prone to reduction under hydrogen, yielding a mixed ionic-electronic conductor. In-plane conductivity measurements of an oriented film of HLaNb 2 O 7 ‚0.5H 2 O showed enhanced ionic conductivity attributed to the anisotropic conductivity of the sheets, but reduction under a hydrogen atmosphere was apparent. The reduction could be suppressed by adding water vapor to the ambient atmosphere or by replacing the B-site niobium with tantalum, which is less easily reduced.

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“…Furthermore, it has been developed and broadly used for various processes [25][26][27][28][29][30][31][32][33][34][35][36][37]: electrochemical hydrogen pumping and purification in FC systems [38], extraction of hydrogen from hydrogen containing gases [39], steam electrolysis to produce pure hydrogen [40,41], dehydration of methane gas for coupling reactions [42][43][44], sensors applications [45] and so on. In this study, its working principle is further developed and adapted for electrochemical characterization of PEM EHEC electrodes.…”

Section: The Easytest Cell Principlementioning

confidence: 99%