First-principles calculations of barium hydride for hydrogen transport applications

ORAL

Abstract

Barium hydride is one of several thermally stable alkaline earth hydrides (AeH$_2$; Ae = Sr, Ca, Ba) to hold potential interest for future hydrogen transport applications, based on its high conductivity of hydride ions over a broad temperature range. However, the underlying materials processes at play in promoting this conductivity remain to be elucidated. A greater understanding of the mechanisms enabling efficient hydride ion migration within BaH$_2$ is needed to move the material closer to applications. Toward that end, we conduct first-principles calculations based on density functional theory with a hybrid functional. We characterize the bulk electronic and structural properties of BaH$_2$ and study the mechanism of hydride ion migration and the influence of native point defects on ionic conductivity.

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Authors

  • Andrew Rowberg

    Materials Department, University of California, Santa Barbara

  • Leigh Weston

    Materials Department, University of California, Santa Barbara, University of California, Santa Barbara

  • Chris G. Van de Walle

    Materials Department, University of California, Santa Barbara, University of California, Santa Barbara, Univ of California - Santa Barbara, University of California - Santa Barbara