Hydration of Proton-conducting BaCe0.9Y0.1O3−δ by Decoupled Mass Transport
Abstract Mass relaxation profile of a perovskite-type oxide, BaCe0.9Y0.1O3−δ, was studied to understand decoupled diffusion of oxygen and hydrogen species during hydration/dehydration. The mass relaxation measurements are performed by thermogravimetric analysis (TGA) under various humidity condition...
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| Main Authors: | , , , |
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| Format: | article |
| Language: | EN |
| Published: |
Nature Portfolio
2017
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| Subjects: | |
| Online Access: | https://doaj.org/article/a1c81d29877f4fc2a68d89e5fee5b512 |
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| Summary: | Abstract Mass relaxation profile of a perovskite-type oxide, BaCe0.9Y0.1O3−δ, was studied to understand decoupled diffusion of oxygen and hydrogen species during hydration/dehydration. The mass relaxation measurements are performed by thermogravimetric analysis (TGA) under various humidity conditions (Dry, −3.0 ≤ log(pH2O/atm) ≤ −1.6) at a constant oxygen partial pressure (log(pO2/atm) = −1.00 ± 0.01). The decoupled ions participated in hydration/dehydration reactions were proven to be at different ratios from the result introduced by the 8R m function. The enthalpy and entropy of non-stoichiometric hydration reaction, which considers each ratio of charge-carrier species, were −144.7 ± 3.7 kJ/mol and −147.8 ± 3.2 J/mol · K, respectively. |
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