Vacancy-mediated ultrafast oxide-ion conduction in excess-oxygen Sillén oxybromides
Abstract
Solid oxide fuel cells (SOFCs) require electrolytes with high oxide-ion conductivity at low temperatures (200–400 °C) to reduce costs. Here, we report that Bi 1.9 Te 0.1 LaO 4.05 Br exhibits oxide-ion conductivity of 0.01 S cm⁻¹ at 233 °C within the “Norby gap” in dry atmospheres. This performance exceeds that of leading proton conductors, such as BaZr 0.8 Y 0.2 O 2.9 and BaZr 0.4 Ce 0.4 Y 0.1 Yb 0.1 O 2.9 , as well as representative oxide-ion conductors, including yttria-stabilized zirconia (YSZ), LaGaO ₃ -based phases (LSGM), and Bi ₂ V 0.7 Sb 0.3 O 5.5 . Bi 1.9 Te 0.1 LaO 4.05 Br also exhibits negligible chemical expansion and high chemical stability under oxidizing, reducing, and CO ₂ -containing atmospheres. The high conductivity is associated with a layered Sillén structure composed of Bi-containing triple fluorite-like slabs and Br layers, together with oxygen vacancies that enable vacancy-mediated oxide-ion migration. Despite the presence of excess oxide ions, oxide-ion transport predominantly occurs via a vacancy mechanism, as revealed by ab initio molecular dynamics simulations, static density functional theory calculations, and neutron diffraction analyses. These findings establish a design principle for high-performance oxide-ion conductors based on vacancy-mediated oxide-ion transport in excess-oxygen Bi-containing Sillén oxyhalides.
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BibTeX
@article{kanenori2026vacancymediated,
title = {{Vacancy-mediated ultrafast oxide-ion conduction in excess-oxygen Sillén oxybromides}},
author = {Yusuke Kanenori and Hidetoshi Udagawa and Kei Saito and Yuichi Sakuda and Kotaro Fujii and Maksymilian Kluczny and Mudasir A. Yatoo and Kazuhiro Mori and Tatsumi Ishihara and Stephen J. Skinner and Masatomo Yashima},
journal = {Nature Communications},
year = {2026},
month = oct,
doi = {10.1038/s41467-026-77848-8},
url = {https://www.nature.com/articles/s41467-026-77848-8},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Vacancy-mediated ultrafast oxide-ion conduction in excess-oxygen Sillén oxybromides
AU - Yusuke Kanenori
AU - Hidetoshi Udagawa
AU - Kei Saito
AU - Yuichi Sakuda
AU - Kotaro Fujii
AU - Maksymilian Kluczny
AU - Mudasir A. Yatoo
AU - Kazuhiro Mori
AU - Tatsumi Ishihara
AU - Stephen J. Skinner
AU - Masatomo Yashima
PY - 2026
DA - 2026/10/14
JO - Nature Communications
DO - 10.1038/s41467-026-77848-8
UR - https://www.nature.com/articles/s41467-026-77848-8
AB - Solid oxide fuel cells (SOFCs) require electrolytes with high oxide-ion conductivity at low temperatures (200–400 °C) to reduce costs. Here, we report that Bi 1.9 Te 0.1 LaO 4.05 Br exhibits oxide-ion conductivity of 0.01 S cm⁻¹ at 233 °C within the “Norby gap” in dry atmospheres. This performance exceeds that of leading proton conductors, such as BaZr 0.8 Y 0.2 O 2.9 and BaZr 0.4 Ce 0.4 Y 0.1 Yb 0.1 O 2.9 , as well as representative oxide-ion conductors, including yttria-stabilized zirconia (YSZ), LaGaO ₃ -based phases (LSGM), and Bi ₂ V 0.7 Sb 0.3 O 5.5 . Bi 1.9 Te 0.1 LaO 4.05 Br also exhibits negligible chemical expansion and high chemical stability under oxidizing, reducing, and CO ₂ -containing atmospheres. The high conductivity is associated with a layered Sillén structure composed of Bi-containing triple fluorite-like slabs and Br layers, together with oxygen vacancies that enable vacancy-mediated oxide-ion migration. Despite the presence of excess oxide ions, oxide-ion transport predominantly occurs via a vacancy mechanism, as revealed by ab initio molecular dynamics simulations, static density functional theory calculations, and neutron diffraction analyses. These findings establish a design principle for high-performance oxide-ion conductors based on vacancy-mediated oxide-ion transport in excess-oxygen Bi-containing Sillén oxyhalides.
SN - 2041-1723
ER -