Perovskite-Structured BaScO2(OH) as a Novel Proton Conductor: Heavily Hydrated Phase Obtained via Low-Temperature Synthesis

• DOI: 10.1021/cm302983d
• Publication Date: 2013-03-20T12:37:21Z
• Authors: Rinlee B. Cervera; Shogo Miyoshi; Yukiko Oyama; Youssef E. Elammari; Takehiko Yagi; Shu Yamaguchi
• Keywords: Proton conductor; Atmospheric temperature range; Acceptor

A novel proton-conducting material, BaScO2(OH) has been successfully fabricated. The known high-temperature proton conductors are typically perovskite-type oxides, in which the concentration is determined by hydration reaction of oxygen vacancies introduced a small amount acceptor dopant. On other hand, material still associated with A2+B4+O3 perovskite structure but B-site cation fully consisting an Sc3+, facilitates to retain appreciable protonic defects. While it difficult obtain simply hydrating unhydrated form (Ba2Sc2O5), combination new low-temperature sol–gel synthesis and ultrahigh-pressure (4 GPa) compaction at room-temperature enables us heavily hydrated phase due on-synthesis hydration. synthesized proved be pseudocubic XRD Raman analyses. thermal dehydration analyses have verified composition terms concentration, their mobile nature observed situ FT-IR analysis. conductivity as high 1.7 × 10–2 S·cm–1 500 °C, well higher than total best oxides intermediate temperature range.