Pure H⁻ conduction in oxyhydrides

A variety of proton (H⁺)–conducting oxides are known, including those used in electrochemical devices such as fuel cells. In contrast, pure H⁻ conduction, not mixed with electron conduction, has not been demonstrated for oxide-based materials. Considering that hydride ions have an ionic size appropr...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2016-03, Vol.351 (6279), p.1314-1317
Main Authors: Kobayashi, Genki, Hinuma, Yoyo, Matsuoka, Shinji, Watanabe, Akihiro, Iqbal, Muhammad, Hirayama, Masaaki, Yonemura, Masao, Kamiyama, Takashi, Tanaka, Isao, Kanno, Ryoji
Format: Article
Language:English
Subjects:
Biological activity
Conductivity
Hydrogen
Ions
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Summary:A variety of proton (H⁺)–conducting oxides are known, including those used in electrochemical devices such as fuel cells. In contrast, pure H⁻ conduction, not mixed with electron conduction, has not been demonstrated for oxide-based materials. Considering that hydride ions have an ionic size appropriate for fast transport and also a strong reducing ability suitable for high-energy storage and conversion devices, we prepared a series of K₂NiF₄-type oxyhydrides, La2-x-ySrx+yLiH1-x+yO3-y, in the hope of observing such H⁻ conductors. The performance of an all-solid-state TiH₂/o-La₂LiHO₃ (x = y = 0, o: orthorhombic)/Ti cell provided conclusive evidence of pure H⁻ conduction.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.aac9185