A research group led by Prof. Tatsumi Ishihara of the International Institute for Carbon-Neutral Energy Research (I2CNER), Kyushu University, Prof. Masatomo Yashima of Institute of Science Tokyo, and Prof. Stephen Skinner of Imperial College London, who serves as a Principal Investigator (PI) at I2CNER, has discovered a new Sillén oxybromide, Bi1.9Te0.1LaO4.05Br, that exhibits a world-leading oxide-ion conductivity of 10 mS cm⁻¹ at 233°C in the temperature and ionic conductivity regime known as the “Norby gap.”
This material is expected not only to enable applications in next-generation electrochemical devices, such as low-temperature solid oxide fuel cells (SOFCs), but also to open up a new field of “oxide-ionics” and usher in a new era of ultrafast oxide-ion conductors.
The research findings were published online in the international scientific journal Nature Communications on October 14, 2026 (UK time).
The full press release is available on the Kyushu University website.
Paper Information
Journal：Nature Communications
Title：Vacancy-mediated ultrafast oxide-ion conduction in excess-oxygen Sillén oxybromides
Authors：Yusuke Kanenori, Hidetoshi Udagawa, Kei Saito, Yuichi Sakuda, Kotaro Fujii, Maksymilian Kluczny, Mudasir A. Yatoo, Kazuhiro Mori, Tatsumi Ishihara, Stephen J. Skinner, Masatomo Yashima*
DOI：10.1038/s41467-026-77848-8
