Electrochemistry
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Ambient Pressure Synthesis and H Conductivity of LaSrLiH2O2
Akihiro WATANABEGenki KOBAYASHINaoki MATSUIMasao YONEMURAAkiko KUBOTAKota SUZUKIMasaaki HIRAYAMARyoji KANNO
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JOURNALS OPEN ACCESS

Volume 85 (2017) Issue 2 Pages 88-92

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Abstract

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−xySrx+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 solid-state 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 × 10−6 S cm−1 at 300°C, which were the same structure and property as that reported previously for a sample synthesized by high-pressure synthesis.

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© 2017 The Electrochemical Society of Japan
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