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

doi:10.1021/acs.inorgchem.9b00046

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

Inorg Chem. 2019 Jul 1;58(13):8300-8307. doi: 10.1021/acs.inorgchem.9b00046. Epub 2019 Jun 13.

Authors

Huawei Chen¹, Shuxiang Zhou², Dane Morgan², Vitali Prakapenka³, Eran Greenberg³, Kurt Leinenweber⁴, Sang-Heon Shim¹

Affiliations

¹ School of Earth and Space Exploration , Arizona State University , Tempe , Arizona 85287-6004 , United States.
² Department of Materials Science and Engineering , University of Wisconsin-Madison , Madison , Wisconsin 53706 , United States.
³ GeoSoilEnviroCars , University of Chicago , Chicago , Illinois 60439 , United States.
⁴ Eyring Materials Center , Arizona State University , Tempe , Arizona 85287-1604 , United States.

PMID: 31194523
DOI: 10.1021/acs.inorgchem.9b00046

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-PtO₂H _x ( 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.