Ambient Pressure Synthesis and H- Conductivity of LaSrLiH2O2

作者：Watanabe Akihiro; Kobayashi Genki; Matsui Naoki; Yonemura Masao; Kubota Akiko; Suzuki Kota; Hirayama Masaaki; Kanno Ryoji

来源：Electrochemistry, 2017, 85(2): 88-92.

DOI：10.5796/electrochemistry.85.88

• Hydride Ion Conductor
• Oxyhydride
• Solid Electrolyte

Recently, hydride ion (H-) has come to be recognized as new charge carrier for the transport of hydrogen in solids by realization of pure H- conduction in BaH2 and La2-x-ySrx+yLiH1-x+yO3-y oxyhydride system (LSLHO). In this study, the H-conductive oxyhydride, LaSrLiH2O2 (x = 0, y = 1 in LSLHO), was synthesized by a conventional solidstate reaction at ambient pressure. The crystal structure of LaSrLiH2O2, as well as the H-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 K2NiF4-type layered perovskite structure composed of alternately stacked tetragonal (LiH2)-and (LaSrO2)(+) layers, and exhibited a conductivity of H-of 3.2 x 10(-6) S cm(-1) at 300 degrees C, which were the same structure and property as that reported previously for a sample synthesized by high-pressure synthesis.

• 出版日期2017-2