The O-O Bonding and Hydrogen Storage in the Pyrite-type PtO2

Huawei Chen, Shuxiang Zhou, Dane Morgan, Vitali Prakapenka, Eran Greenberg, Kurt Leinenweber, Sang-Heon Shim

Research output: Contribution to journalArticle

Abstract

We have synthesized pyrite-type PtO2 (py-PtO2) at 50-60 GPa and successfully recovered it at 1 bar. The observed O-O stretching vibration in Raman spectra provides direct evidence for inter-oxygen bonding in the structure. We also identified the O-H vibrations in py-PtO2 synthesized from the low-temperature areas, indicating hydrogenation, py-PtO2Hx (x ≤ 1). Diffraction patterns are consistent with a range of degrees of hydrogenation controlled by temperature. We found that py-PtO2 has a high bulk modulus, 314 ± 4 GPa. The chemical behaviors found in py-PtO2 have implications for the hydrogen storage in materials with anion-anion bonding, and the geochemistry of oxygen, hydrogen, and transition metals in the deep planetary interiors.

Original languageEnglish (US)
JournalInorganic Chemistry
DOIs
StatePublished - Jan 1 2019

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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