Journal
NATURE COMMUNICATIONS
Volume 12, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41467-020-20859-w
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [JP15H02291, JP16H00884, JP16H06293, JP16H06440, JP16H06441, JP16H06438, JP16K21724, JP17K17717, JP17H06222, JP19H00821]
- Adaptable and Seamless Technology transfer Program through Target-driven R&D (A-STEP) from Japan Science and Technology Agency (JST) [JPMJTM19AY]
- JSPS Core-to-Core Program, A. Advanced Research Networks (Solid Oxide Interfaces for Faster Ion Transport)
- EPSRC [EP/P026478/1] Funding Source: UKRI
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Oxide-ion conductors are crucial in various applications for clean energy. The high oxide-ion conductivity of the hexagonal perovskite-related oxide Ba7Nb3.9Mo1.1O20.05, attributed to interstitialcy diffusion and low activation energy for oxide-ion conductivity, is reported by the authors.
Oxide-ion conductors are important in various applications such as solid-oxide fuel cells. Although zirconia-based materials are widely utilized, there remains a strong motivation to discover electrolyte materials with higher conductivity that lowers the working temperature of fuel cells, reducing cost. Oxide-ion conductors with hexagonal perovskite related structures are rare. Herein, we report oxide-ion conductors based on a hexagonal perovskite-related oxide Ba7Nb4MoO20. Ba7Nb3.9Mo1.1O20.05 shows a wide stability range and predominantly oxide-ion conduction in an oxygen partial pressure range from 2 x 10(-26) to 1atm at 600 degrees C. Surprisingly, bulk conductivity of Ba7Nb3.9Mo1.1O20.05, 5.8 x 10(-4) S cm(-1), is remarkably high at 310 degrees C, and higher than Bi2O3- and zirconia-based materials. The high conductivity of Ba7Nb3.9Mo1.1O20.05 is attributable to the interstitial-O5 oxygen site, providing two-dimensional oxide-ion O1-O5 interstitialcy diffusion through lattice-O1 and interstitial-O5 sites in the oxygen-deficient layer, and low activation energy for oxide-ion conductivity. Present findings demonstrate the ability of hexagonal perovskite related oxides as superior oxide-ion conductors. Oxide-ion conductors are important in various applications for clean energy. Here, authors report high oxide-ion conductivity of hexagonal perovskite-related oxide Ba7Nb3.9Mo1.1O20.05, which is ascribed to the interstitialcy diffusion and low activation energy for oxide-ion conductivity.
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