Ambient Pressure Synthesis and H⁻ Conductivity of LaSrLiH₂O₂ Ambient Pressure Synthesis and H<sup>−</sup> Conductivity of LaSrLiH<sub>2</sub>O<sub>2</sub>

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Author(s)

    • WATANABE Akihiro WATANABE Akihiro
    • Research Center of Integrative Molecular Systems (CIMoS), Institute for Molecular Science|Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
    • KOBAYASHI Genki KOBAYASHI Genki
    • Research Center of Integrative Molecular Systems (CIMoS), Institute for Molecular Science|Japan Science and Technology Agency (JST), Precursory Research for Embryonic Science and Technology (PRESTO)
    • MATSUI Naoki MATSUI Naoki
    • Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
    • YONEMURA Masao YONEMURA Masao
    • Neutron Science Laboratory (KENS), Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)
    • SUZUKI Kota SUZUKI Kota
    • Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
    • KANNO Ryoji KANNO Ryoji
    • Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology

Abstract

Recently, hydride ion (H<sup>−</sup>) has come to be recognized as new charge carrier for the transport of hydrogen in solids by realization of pure H<sup>−</sup> conduction in BaH<sub>2</sub> and La<sub>2−</sub><i><sub>x</sub></i><sub>−</sub><i><sub>y</sub></i>Sr<i><sub>x</sub></i><sub>+</sub><i><sub>y</sub></i>LiH<sub>1−</sub><i><sub>x</sub></i><sub>+</sub><i><sub>y</sub></i>O<sub>3−</sub><i><sub>y</sub></i> oxyhydride system (LSLHO). In this study, the H<sup>−</sup> conductive oxyhydride, LaSrLiH<sub>2</sub>O<sub>2</sub> (<i>x</i> = 0, <i>y</i> = 1 in LSLHO), was synthesized by a conventional solid-state reaction at ambient pressure. The crystal structure of LaSrLiH<sub>2</sub>O<sub>2</sub>, as well as the H<sup>−</sup> conductivity and bonding state of hydrogen, was examined by Rietveld analysis using X-ray and neutron diffraction data, attenuated total reflection Fourier transform spectroscopy (ATR-FTIR), and electrochemical impedance spectroscopy (EIS). The sample synthesized at ambient pressure had a K<sub>2</sub>NiF<sub>4</sub>-type layered perovskite structure composed of alternately stacked tetragonal (LiH<sub>2</sub>)<sup>−</sup> and (LaSrO<sub>2</sub>)<sup>+</sup> layers, and exhibited a conductivity of H<sup>−</sup> of 3.2 × 10<sup>−6</sup> S cm<sup>−1</sup> at 300°C, which were the same structure and property as that reported previously for a sample synthesized by high-pressure synthesis.

Journal

  • Electrochemistry

    Electrochemistry 85(2), 88-92, 2017

    The Electrochemical Society of Japan

Codes

  • NII Article ID (NAID)
    130005316112
  • NII NACSIS-CAT ID (NCID)
    AN00151637
  • Text Lang
    ENG
  • ISSN
    1344-3542
  • NDL Article ID
    027925648
  • NDL Call No.
    Z17-14
  • Data Source
    NDL  J-STAGE 
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