On Hydride Diffusion in Transition Metal Perovskite Oxyhydrides Investigated via Deuterium Exchange

Ya Tang, Yoji Kobayashi, Kazuki Shitara, Ayako Konishi, Akihide Kuwabara, Takahide Nakashima, Cédric Tassel, Takafumi Yamamoto, Hiroshi Kageyama

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Perovskite oxyhydrides may find diverse applications, ranging from catalysis, topochemical synthesis to solid state ionics, but the understanding of their hydride transport behavior has remained limited. Here, gaseous hydrogen exchange and release experiments were analyzed using the Kissinger method to estimate the activation energy (Ea) for H/D exchange and H2 release in BaTiO3-xHx (x = 0.35-0.60) and LaSrCoO3H0.70. It is revealed that, for each BaTiO3-xHx at a given hydride concentration (x), both H/D exchange and H2 release experiments provide similar Ea values. For BaTiO3-xHx with different x, the obtained Ea values significantly decrease with increasing x until around 0.4; beyond 0.4, it becomes nearly constant (200-220 kJ mol-1). This observation suggests that the diffusion process in the low hydride concentration (x < 0.4) includes oxide as well as hydride diffusion, whereas, for 0.4 < x (
Original languageEnglish (US)
Pages (from-to)8187-8194
Number of pages8
JournalChemistry of Materials
Volume29
Issue number19
DOIs
StatePublished - Oct 10 2017
Externally publishedYes

Bibliographical note

Generated from Scopus record by KAUST IRTS on 2022-09-13

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemical Engineering(all)
  • Chemistry(all)

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