Characteristic fast H− ion conduction in oxygen-substituted lanthanum hydride

Keiga Fukui, Soshi Iimura (), Tomofumi Tada, Satoru Fujitsu, Masato Sasase, Hiromu Tamatsukuri, Takashi Honda, Kazutaka Ikeda, Toshiya Otomo and Hideo Hosono ()
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Keiga Fukui: Tokyo Institute of Technology
Soshi Iimura: Tokyo Institute of Technology
Tomofumi Tada: Tokyo Institute of Technology
Satoru Fujitsu: Tokyo Institute of Technology
Masato Sasase: Tokyo Institute of Technology
Hiromu Tamatsukuri: High Energy Accelerator Research Organization (KEK)
Takashi Honda: High Energy Accelerator Research Organization (KEK)
Kazutaka Ikeda: High Energy Accelerator Research Organization (KEK)
Toshiya Otomo: High Energy Accelerator Research Organization (KEK)
Hideo Hosono: Tokyo Institute of Technology

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Fast ionic conductors have considerable potential to enable technological development for energy storage and conversion. Hydride (H−) ions are a unique species because of their natural abundance, light mass, and large polarizability. Herein, we investigate characteristic H− conduction, i.e., fast ionic conduction controlled by a pre-exponential factor. Oxygen-doped LaH3 (LaH3−2xOx) has an optimum ionic conductivity of 2.6 × 10−2 S cm−1, which to the best of our knowledge is the highest H− conductivity reported to date at intermediate temperatures. With increasing oxygen content, the relatively high activation energy remains unchanged, whereas the pre-exponential factor decreases dramatically. This extraordinarily large pre-exponential factor is explained by introducing temperature-dependent enthalpy, derived from H− trapped by lanthanum ions bonded to oxygen ions. Consequently, light mass and large polarizability of H−, and the framework comprising densely packed H− in LaH3−2xOx are crucial factors that impose significant temperature dependence on the potential energy and implement characteristic fast H− conduction.

Date: 2019
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DOI: 10.1038/s41467-019-10492-7

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