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Hydration of Proton-conducting BaCe0.9Y0.1O3-? by Decoupled Mass Transport.

ABSTRACT: Mass relaxation profile of a perovskite-type oxide, BaCe0.9Y0.1O3-?, 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.

PROVIDER: S-EPMC5428669 | BioStudies |

REPOSITORIES: biostudies

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