Publication date: 10th April 2024
Hydride ions (H−) have attracted attention as fast ionic carriers contributing to the realization of next-generation electrochemical devices. Though several metal hydrides and oxyhydrides with high H− conductivity have been reported,[1-3] the mechanism of fast H− conduction has not yet been fully revealed. The low charge density of H−s leads to large polarizability (αH− = 10.17 Å3),[4] which may provide an inspiration that H−s delocalize and conduct through the sublattice of electropositive cations. This migration feature contrasts with protons with extremely high charge density.
In this work, we report the occurrence of mixed conduction in lanthanum oxyhydrides (LaH3−2xOx) known to be pure H− conductors when hydrogen-blocking electrodes are deposited.[3] We prepared highly sintered LaH3−2xOx pellets with Pd electrodes for hydrogen concentration cells and measured the electro-motive force (emf). The polarity of the emf voltage indicates that the H−s are mobile ion species. However, the ion transference number calculated from the magnitude of emf was not unity but almost 0.5, indicating that H−s and other charge carriers transport in LaH3−2xOx. This talk will discuss identifying charge carriers other than H−s will be discussed based on the results of hydrogen permeation measurements for LaH3−2xOx.
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