title: Pure H⁻ conduction in oxyhydrides.
abstract: A variety of proton (H(+))-conducting oxides are known, including those used in electrochemical devices such as fuel cells. In contrast, pure H(-) conduction, not mixed with electron conduction, has not been demonstrated for oxide-based materials. Considering that hydride ions have an ionic size appropriate for fast transport and also a strong reducing ability suitable for high-energy storage and conversion devices, we prepared a series of K2NiF4-type oxyhydrides, La(2-x-y)Sr(x + y)LiH(1-x + y)O(3-y), in the hope of observing such H(-) conductors. The performance of an all-solid-state TiH2/o-La2LiHO3 (x = y = 0, o: orthorhombic)/Ti cell provided conclusive evidence of pure H(-) conduction.
authors.affiliation: Research Center of Integrative Molecular Systems (CIMoS), Institute for Molecular Science, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan. Japan Science and Technology Agency (JST), Precursory Research for Embryonic Science and Technology (PRESTO), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan. gkobayashi@ims.ac.jp kanno@echem.titech.ac.jp.
authors.forename: Genki
authors.initials: G
authors.lastname: Kobayashi
authors.affiliation: Department of Materials Science and Engineering, Kyoto University, Sakyo, Kyoto 606-8501, Japan.
authors.forename: Yoyo
authors.initials: Y
authors.lastname: Hinuma
authors.affiliation: Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8502, Japan.
authors.forename: Shinji
authors.initials: S
authors.lastname: Matsuoka
authors.affiliation: Research Center of Integrative Molecular Systems (CIMoS), Institute for Molecular Science, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585, Japan. Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8502, Japan.
authors.forename: Akihiro
authors.initials: A
authors.lastname: Watanabe
authors.affiliation: Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8502, Japan.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Iqbal
authors.affiliation: Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8502, Japan.
authors.forename: Masaaki
authors.initials: M
authors.lastname: Hirayama
authors.affiliation: Neutron Science Laboratory (KENS), Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 203-1, Shirakata, Tokai, Ibaraki 319-1106, Japan.
authors.forename: Masao
authors.initials: M
authors.lastname: Yonemura
authors.affiliation: Neutron Science Laboratory (KENS), Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 203-1, Shirakata, Tokai, Ibaraki 319-1106, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Kamiyama
authors.affiliation: Department of Materials Science and Engineering, Kyoto University, Sakyo, Kyoto 606-8501, Japan.
authors.forename: Isao
authors.initials: I
authors.lastname: Tanaka
authors.affiliation: Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8502, Japan. gkobayashi@ims.ac.jp kanno@echem.titech.ac.jp.
authors.forename: Ryoji
authors.initials: R
authors.lastname: Kanno