"Electropositive Metal Doping into Lanthanum Hydride for H− Conducting Solid Electrolyte Use at Room Temperature"
Y. Izumi, F. Takeiri, K. Okamoto, T. Saito, T. Kamiyama, A. Kuwabara, G. Kobayashi
Adv. Energy Mater.,  2301993 (2023).

"Impact of Na Concentration on the Phase Transition Behavior and H– Conductivities in the Ba-Li-Na-H-O Oxyhydride System"
K. Okamoto, F. Takeiri, Y. Imai, M. Yonemura, T. Saito, K. Ikeda, T. Otomo, T. Kamiyama, G. Kobayashi
Adv. Sci., 10, 2203541 (2022).

"Stabilization of a high H−-conducting phase via K doping of Ba–Li oxyhydride"
K. Okamoto, F. Takeiri, Y. Imai, M. Yonemura, T. Saito, K. Ikeda, T. Otomo, T. Kamiyama, G. Kobayashi
J. Mater. Chem. A, 10, 23023 (2022).

“Hydride-ion-conducting K2NiF4-type Ba–Li oxyhydride solid electrolyte”
F. Takeiri, A. Watanabe, K. Okamoto, D. Bresser, S. Lyonnard, B. Frick, A. Ali, Y. Imai, M. Nishikawa, M. Yonemura, T. Saito, K. Ikeda, T. Otomo, T. Kamiyama, R. Kanno, G. Kobayashi
Nature Materials, 21, 325 (2022).

“Effects of mechanical grinding on the phase behavior and anhydrous proton conductivity of imidazolium hydrogen succinate”
S. Dekura, Y. Sunairi, K. Okamoto, F. Takeiri, G. Kobayashi, Y. Hori, Y. Shigeta, H. Mori
Solid State Ionics, 372, 115775 (2021).

“Direct synthesis of barium titanium oxyhydride for use as a hydrogen-permeable electrode”
T. Uchimura, F. Takeiri, K. Okamoto, T. Saito, T. Kamiyama, G. Kobayashi
J. Mater. Chem. A, 9, 20371 (2021).