[Report] 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 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. Authors: Genki Kobayashi, Yoyo Hinuma, Shinji Matsuoka, Akihiro Watanabe, Muhammad Iqbal, Masaaki Hirayama, Masao Yonemura, Takashi Kamiyama, Isao Tanaka, Ryoji Kanno