Although using proton (H+) conductors is attractive for energy applications, practical conductivity at intermediate temperatures (200–400 °C) remains a challenge. A K2NiF4-type Ba–Li oxyhydride is shown to exhibit a temperature-independent hydrogen conductivity of more than 0.01 S cm–1 above 315 °C.
- Fumitaka Takeiri
- Akihiro Watanabe
- Genki Kobayashi
