title: Hydration of Proton-conducting BaCe0.9Y0.1O3-δby 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 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 8Rmfunction. 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.
authors.affiliation: Department of Materials Science and Engineering, Chonnam National University, Gwangju, 61186, Republic of Korea.
authors.forename: Dae-Kwang
authors.initials: DK
authors.lastname: Lim
authors.affiliation: Department of Materials Science and Engineering, Chonnam National University, Gwangju, 61186, Republic of Korea.
authors.forename: Ha-Ni
authors.initials: HN
authors.lastname: Im
authors.affiliation: Department of Materials Science and Engineering, Chonnam National University, Gwangju, 61186, Republic of Korea. song@chonnam.ac.kr.
authors.forename: Sun-Ju
authors.initials: SJ
authors.lastname: Song
authors.affiliation: Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea.
authors.forename: Han-Ill
authors.initials: HI
authors.lastname: Yoo