Synthesis, crystal structure, and ionic conductivity of hydride ion- conducting Ln2LiHO3 ( Ln 1/4 La, Pr, Nd) oxyhydrides

被引：36

作者：

Iwasaki, Yuki ^{[1
]}

Matsui, Naoki ^{[1
]}

Suzuki, Kota ^{[1
,2
]}

Hinuma, Yoyo ^{[3
,4
]}

Yonemura, Masao ^{[5
]}

Kobayashi, Genki ^{[6
,7
]}

Hirayama, Masaaki ^{[1
,2
]}

Tanaka, Isao ^{[4
,8
,9
,10
]}

Kanno, Ryoji ^{[1
,2
]}

机构：

[1] Tokyo Inst Technol, Sch Mat & Chem Technol, Dept Chem Sci & Engn, Midori Ku, 4259 Nagatsuta, Yokohama, Kanagawa 2268502, Japan

[2] Tokyo Inst Technol, Inst Innovat Res, All Solid State Battery Unit, Midori Ku, 4259 Nagatsuta, Yokohama, Kanagawa 2268503, Japan

[3] Chiba Univ, Ctr Frontier Sci, Inage Ku, 1-33 Yayoi Cho, Chiba 2638522, Japan

[4] Natl Inst Mat Sci, Res & Serv Div Mat Data & Integrated Syst, Ctr Mat Res Informat Integrat, 1-2-1 Sengen, Tsukuba, Ibaraki 3050047, Japan

[5] High Energy Accelerator Res Org KEK, Neutron Sci Lab KENS, Inst Mat Struct Sci, 1-1 Oho, Tsukuba, Ibaraki 3050801, Japan

[6] Natl Inst Nat Sci, Dept Mat Mol Sci, Inst Mol Sci, 38 Nishigonaka, Okazaki, Aichi 4448585, Japan

[7] SOKENDAI Grad Univ Adv Studies, 38 Nishigonaka, Okazaki, Aichi 4448585, Japan

[8] Kyoto Univ, Dept Mat Sci & Engn, Kyoto 6068501, Japan

[9] Kyoto Univ, Ctr Elements Strategy Initiat Struct Mat ESISM, Kyoto 6068501, Japan

[10] Japan Fine Ceram Ctr, Nanostruct Res Lab, Nagoya, Aichi 4568587, Japan

来源：

JOURNAL OF MATERIALS CHEMISTRY A | 2018年 / 6卷 / 46期

基金：

日本学术振兴会;

关键词：

PRESSURE; DYNAMICS; CATHODES;

D O I：

10.1039/c8ta06880a

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Hydride ion (H-)-conducting solids could contribute to the development of novel electrochemical devices using unique H- conduction phenomena. However, understanding the new class of H- conducting oxyhydrides is still undergoing. In this study, new H- conducting Ln(2)LiHO(3) (Ln = La, Pr, Nd) oxyhydrides were synthesised using a high-pressure (2 GPa) method. Structural analysis revealed that the anion arrangement in the axial sites of the perovskite unit depends on the Ln ions and strongly affects hydride conductivity. Nd2LiHO3, which has a space group Immm, in which approximate to 5% of the O sites (2d) are occupied instead by H, had the highest conductivity at 280 degrees C of 2.2 x 10(-5) S cm(-1). The possibility of long-distance H- diffusion in Ln(2)LiHO(3) was computationally investigated. The results corroborate the experimental findings, which indicate that lower O content promotes anion migration.

引用

页码：23457 / 23463

页数：7

共 31 条

[1] La and Sr substituted Pr2NiO4+delta: Oxygenation and electrical properties [J].