Hydrogen permeation through dense BaCe 0.8 Y 0.2 O 3−δ – Ce 0.8 Y 0.2 O 2−δ composite-ceramic hydrogen separation membranes

Rosensteel, Wade A.; Ricote, Sandrine; Sullivan, Neal P.

doi:10.1016/j.ijhydene.2015.11.053

Cited by 56 publications

(23 citation statements)

References 57 publications

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“…According to62, no contribution of water splitting to the H 2 permeation could be evidenced at lower water vapor pressure at the sweep side due to omitting Pt catalyst layer. However, cercer composites were just recently identified as promising candidates for H 2 permeation membranes, therefore detailed studies have not been yet done to assign different reaction contributions to the overall H 2 flux.…”

Section: Resultsmentioning

confidence: 97%

Hydrogen separation through tailored dual phase membranes with nominal composition BaCe0.8Eu0.2O3-δ:Ce0.8Y0.2O2-δ at intermediate temperatures

Ivanova

Escolástico

Balaguer

et al. 2016

Sci Rep

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Hydrogen permeation membranes are a key element in improving the energy conversion efficiency and decreasing the greenhouse gas emissions from energy generation. The scientific community faces the challenge of identifying and optimizing stable and effective ceramic materials for H2 separation membranes at elevated temperature (400–800 °C) for industrial separations and intensified catalytic reactors. As such, composite materials with nominal composition BaCe0.8Eu0.2O3-δ:Ce0.8Y0.2O2-δ revealed unprecedented H2 permeation levels of 0.4 to 0.61 mL·min−1·cm−2 at 700 °C measured on 500 μm-thick-specimen. A detailed structural and phase study revealed single phase perovskite and fluorite starting materials synthesized via the conventional ceramic route. Strong tendency of Eu to migrate from the perovskite to the fluorite phase was observed at sintering temperature, leading to significant Eu depletion of the proton conducing BaCe0.8Eu0.2O3-δ phase. Composite microstructure was examined prior and after a variety of functional tests, including electrical conductivity, H2-permeation and stability in CO2 containing atmospheres at elevated temperatures, revealing stable material without morphological and structural changes, with segregation-free interfaces and no further diffusive effects between the constituting phases. In this context, dual phase material based on BaCe0.8Eu0.2O3-δ:Ce0.8Y0.2O2-δ represents a very promising candidate for H2 separating membrane in energy- and environmentally-related applications.

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Section: Resultsmentioning

confidence: 97%

Hydrogen separation through tailored dual phase membranes with nominal composition BaCe0.8Eu0.2O3-δ:Ce0.8Y0.2O2-δ at intermediate temperatures

Ivanova

Escolástico

Balaguer

et al. 2016

Sci Rep

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“…Single phase MPECs can have good stability but prohibitively low H 2 permeation fluxes. However, when a second electrically conducting phase is added, H 2 permeation values can be much higher [3][4][5][6] . BaCe 0.8 Y 0.2 O 3-δ -Ce 0.8 Y 0.2 O 2-δ (BCY-YDC) in which the BCY phase is the primary proton conductor and the YDC phase is the electronically active phase, 7 has shown promising H 2 permeation results 4 and is the focus of the current work.…”

Section: Introductionmentioning

confidence: 99%

“…However, when a second electrically conducting phase is added, H 2 permeation values can be much higher [3][4][5][6] . BaCe 0.8 Y 0.2 O 3-δ -Ce 0.8 Y 0.2 O 2-δ (BCY-YDC) in which the BCY phase is the primary proton conductor and the YDC phase is the electronically active phase, 7 has shown promising H 2 permeation results 4 and is the focus of the current work. Solid solutions of yttrium doped barium zirconate/ cerate (BCZY), while exhibiting slightly decreased ionic conductivity, have since been shown to overcome some of the degradation issues associated with the operating environment including better CO 2 3 and S tolerance, 8 compared to membranes prepared with BCY.…”

Section: Introductionmentioning

confidence: 99%

Quantification of grain boundary defect chemistry in a mixed proton‐electron conducting oxide composite

et al. 2020

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Dual phase oxide membranes have shown promising hydrogen permeation fluxes in syngas applications due to their high mixed proton electron conduction (MPEC). However, the conductivity of grain boundaries can be many orders of magnitude lower than that of the bulk and so limits the total conductivity and hydrogen permeation. In this study, the three‐dimensional nanoscale oxygen and cation distributions around grain and phase boundaries in a BaCe0.8Y0.2O3‐δ‐Ce0.8Y0.2O2‐δ (BCY‐YDC) membrane were quantified by atom probe tomography (APT) and related to average grain boundary conductivity measured by electrochemical impedance spectroscopy (EIS). Segregation varied among the general high‐angle grain boundaries analyzed, but no trend from orientation analysis was determined. Correlative APT and electron energy loss spectroscopy (EELS) of one YDC grain boundary revealed composition and cerium valence information, respectively, allowing for the determination of vacancies at the grain boundary. While a specific MPEC membrane is characterized, the results are relevant to proton and electron conduction in a number of technologically important ceramics.

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“…It is noteworthy the significant H 2 fluxes obtained with several cermets as Ni-BaCe 0.9 Y 0.1 O 3- [11], Ni-BaZr 0.1 Ce 0.7 Y 0.2 O 3- [12] and Ni-BaCe 0.85 Tb 0.05 Zr 0.1 O 3- [13]. As well as the cer-cers based on BaCeO 3- or BaCe 1-x Zr x O 3- based materials as protonic phase and doped ceria as electronic phase [14,15].…”

Section: Introductionmentioning

confidence: 99%

Catalytic activation of ceramic H2 membranes for CMR processes

Escolástico

Kjølseth²,

Serra

2016

Journal of Membrane Science

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The application of catalytic membrane reactors can overcome some of the disadvantages that reactions for the direct conversion of methane to fuels and petrochemicals present. Hydrogen separation membranes can shift the reaction equilibrium by hydrogen removal, improving the separation, selectivity and yield of the reactions. La 5.5 WO 11.25-δ /La 0.87 Sr 0.13 CrO 3-δ (LWO/LSC) based membranes present a high H 2 flux within the temperature range where CMR can be applied. However, the catalytic activity of the material is very low and it has to be improved.This work presents the development of different catalytic layers based on LSC material and the study of their influence on the H 2 flux obtained by using 60/40-LWO/LSC membranes.Membranes coated with porous layer made of Ni-infiltrated La 0.75 Ce 0.1 Sr 0.15 CrO 3-δ exhibited the best permeation flux but still 20% lower than the one reached using Pt layers. Stability of the catalytic layers is also evaluated under H 2 permeation conditions and under high steam content methane.

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Hydrogen permeation through dense BaCe 0.8 Y 0.2 O 3−δ – Ce 0.8 Y 0.2 O 2−δ composite-ceramic hydrogen separation membranes

Cited by 56 publications

References 57 publications

Hydrogen separation through tailored dual phase membranes with nominal composition BaCe0.8Eu0.2O3-δ:Ce0.8Y0.2O2-δ at intermediate temperatures

Hydrogen separation through tailored dual phase membranes with nominal composition BaCe0.8Eu0.2O3-δ:Ce0.8Y0.2O2-δ at intermediate temperatures

Quantification of grain boundary defect chemistry in a mixed proton‐electron conducting oxide composite

Catalytic activation of ceramic H2 membranes for CMR processes

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