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High oxide-ion conductivity through the interstitial oxygen site in Ba7Nb4MoO20-based hexagonal perovskite related oxides
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High oxide-ion conductivity through the interstitial oxygen site in Ba7Nb4MoO20-based hexagonal perovskite related oxides
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Journal Article
High oxide-ion conductivity through the interstitial oxygen site in Ba7Nb4MoO20-based hexagonal perovskite related oxides
2021
Overview
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 Ba
7
Nb
4
MoO
20
. Ba
7
Nb
3.9
Mo
1.1
O
20.05
shows a wide stability range and predominantly oxide-ion conduction in an oxygen partial pressure range from 2 × 10
−26
to 1 atm at 600 °C. Surprisingly, bulk conductivity of Ba
7
Nb
3.9
Mo
1.1
O
20.05
, 5.8 × 10
−4
S cm
−1
, is remarkably high at 310 °C, and higher than Bi
2
O
3
- and zirconia-based materials. The high conductivity of Ba
7
Nb
3.9
Mo
1.1
O
20.05
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 Ba
7
Nb
3.9
Mo
1.1
O
20.05
, which is ascribed to the interstitialcy diffusion and low activation energy for oxide-ion conductivity.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
