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Ambient pressure synthesis of La2LiHO3 as a solid electrolyte for a hydrogen electrochemical cell |
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| Authors: | Naoki Matsui Genki Kobayashi Kota Suzuki Akihiro Watanabe Akiko Kubota Yuki Iwasaki Masao Yonemura Masaaki Hirayama Ryoji Kanno |
| Affiliation: | 1. Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Midori, Yokohama, Japan;2. Department of Materials Molecular Science, Institute for Molecular Science, National Institute of Natural Sciences, Myodaiji, Okazaki, Japan;3. Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Midori, Yokohama, Japan Department of Materials Molecular Science, Institute for Molecular Science, National Institute of Natural Sciences, Myodaiji, Okazaki, Japan;4. Neutron Science Laboratory (KENS), Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tokai, Ibaraki, Japan;5. Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Midori, Yokohama, Japan All-Solid-State Battery Unit, Institute of Innovative Research, Tokyo Institute of Technology, Midori, Yokohama, Japan |
| Abstract: | The capability of La2LiHO3 as a H− conductive solid electrolyte has recently been demonstrated, which has suggested the possibility of developing electrochemical devices based on H− conduction. However, the performance of La2LiHO3 as a solid electrolyte has not yet been fully clarified. In this study, we prepared La2LiHO3 sintered pellets by a conventional solid-state reaction with LiH flux under ambient pressure and characterized the crystal structure and thermal stability (to moisture, ambient air, and oxygen) by neutron and X-ray diffraction measurements. The produced sintered pellets exhibited an activation energy of 69.2 kJ/mol, which is consistent with the value of the sample synthesized by the high-pressure method. The gas-sealing properties of the sintered La2LiHO3 pellets as the H− conductive solid electrolyte were confirmed by measuring the electromotive force using a hydrogen concentration cell. |
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