Entry and exit of water vapor in bulk ceramic proton conductors

Schober, T.; Coors, W. Grover

doi:10.1016/j.ssi.2004.07.019

Cited by 21 publications

(35 citation statements)

References 10 publications

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“…Details are found in [2]. In summary, exposing the sample to D20 led to a strong signal of D20 + after a certain lag time.…”

Section: Resultsmentioning

confidence: 81%

“…The pertinent experimental details for Part 1 are found in [2]. Part 2:BCY20 powder was prepared by sol-gel techniques [8], BCY15 and BCY10 using the mixed oxide route.…”

Section: Experimental Descriptionmentioning

confidence: 99%

“…If the conductivity due to these defects is much larger than the one caused by other defects we have a HTPC. In Part 1 of this work we deal with the entry and exit of water vapor in HTPCs [2]. It is a study of the processes occurring during protonation of the bulk ceramic proton conductors, Bafe0.9YoAO2.95 (BCY10) and BaCe0.sY0.202.9 (BCY20).…”

Section: Introductionmentioning

confidence: 99%

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Proton conducting ceramics: Recent advances

Schober

Ringel

2004

Ionics

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Abstract.A general introduction into the field of high temperature ceramic proton conductors (HTPCs) is given. Results of two typical studies involving these HTPCs are discussed. In the first part a study of the processes occurring during water vapor exposure of bulk ceramic proton conductors, Bafeo.9YoAO2.95 (BCY10) and BaCe0.8Y0.202.9 (BCY20), is presented. A disc of a HTPC was connected to a mass spectrometer in a vacuum system permitting the identification of the species crossing the ceramic-vacuum interface. Exposing the other side of the sample to D20 led to a strong signal of D20 + after a certain lag time. From these lag times the tracer diffusivity of hydrogen could be determined as a function of temperature. The permeation of steam consisted of two components: a fast component, given by the diffusivities of deuterons (protons), and a slow component, assigned to chemical diffusion of deuterons (protons) coupled to oxygen vacancies. The data also suggested the possibility of participation of even more complex defects in this chemical diffusion. Dilatometry measurements of different specimens of BCY10 and BCY20 also revealed quite clearly this two-phase pattern during protonation. Diffusion measurements on protonic ceramic membranes using H2180 permitted the determination of the tracer diffusivity of oxygen. All of the above measurements were interpreted in the light of the chemical diffusion model developed by Kreuer et al.The second part deals with composites of proton conductors and inorganic compounds such as carbonates, hydroxides, chlorides, and fluorides following the work of B. Zhu. Conductivities of such composites are presented. Nernst potentials of various electrochemical cells with these composites are discussed.

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“…Details are found in [2]. In summary, exposing the sample to D20 led to a strong signal of D20 + after a certain lag time.…”

Section: Resultsmentioning

confidence: 81%

“…The pertinent experimental details for Part 1 are found in [2]. Part 2:BCY20 powder was prepared by sol-gel techniques [8], BCY15 and BCY10 using the mixed oxide route.…”

Section: Experimental Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Proton conducting ceramics: Recent advances

Schober

Ringel

2004

Ionics

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“…A condução protônica em perovskitas a altas temperaturas foi verificada em 1981 [20]. Quando óxidos com estrutura perovskita, de fórmula geral ABO 3 , são dopados com cátions de valência menor, estes substituem parcialmente os cátions do sítio B, gerando vacâncias de oxigênio [16].…”

Section: Condutores Protônicosunclassified

“…O condutor protônico zirconato de bário de estrutura perovskita, BaZrO 3 dopado com terras raras, tem atraído atenção como um eletrólito para SOFC operacional em temperaturas intermediárias porque apresenta alta estabilidade química em atmosferas contendo CO 2 [31], bem como alta condutividade protônica em uma faixa de temperaturas intermediárias (< 800 °C) [20]. No entanto, BaZrO 3 é difícil de sinterizar [34].…”

Section: +unclassified

Efeito da adição de óxido de zinco e de óxido de boro nas propriedades do zirconato de bário dopado com ítrio

Andrade

Muccillo

2011

Cerâmica

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Modeling of steam permeation through the high temperature proton‐Conducting ceramic membranes

et al. 2018

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The BaCeO3‐based perovskite oxide can be applied as a steam‐permeable membrane due to their noticeable mixed oxygen ion and proton conducting properties. In this article, a transient model of the steam permeation through the BaCe0.9Y0.1O3‐δ perovskite membrane at elevated temperatures has been developed with the Poisson–Nernst–Planck equations for analyzing the steam permeation process, in which the distribution of charged defects in the membrane is carefully considered. The effects of the operating temperature, the membrane thickness, the steam partial pressure, and the electric potential difference between two membrane sides during the steam permeation have been simulated and discussed. The modeling results indicate there exists a maximum value of the spontaneous electric potential difference with the temperature rise and the external electric potential can obviously increase the steam flux. The model is validated using the experimental results from literature under steady state operational conditions. © 2018 American Institute of Chemical Engineers AIChE J, 65: 777–782, 2019

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Entry and exit of water vapor in bulk ceramic proton conductors

Cited by 21 publications

References 10 publications

Proton conducting ceramics: Recent advances

Proton conducting ceramics: Recent advances

Efeito da adição de óxido de zinco e de óxido de boro nas propriedades do zirconato de bário dopado com ítrio

Modeling of steam permeation through the high temperature proton‐Conducting ceramic membranes

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