Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 108, Issue 46, Pages 18618-18621Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1114680108
Keywords
metal hydrides; phase transition
Categories
Funding
- Swedish Research Council
- National Basic Research Program of China [2011CB808200]
- EFree, an Energy Frontier Research Center
- US Department of Energy (DOE), Office of Science, and Office of Basic Energy Sciences [DE-SC0001057]
- Carnegie Institution of Washington, Carnegie DOE Alliance Center, University of Nevada at Las Vegas
- Lawrence Livermore National Laboratory through DOE-National Nuclear Security Administration, DOE-Basic Energy Sciences
- National Science Foundation
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Materials with very high hydrogen density have attracted considerable interest due to a range of motivations, including the search for chemically precompressed metallic hydrogen and hydrogen storage applications. Using high-pressure synchrotron X-ray diffraction technique and theoretical calculations, we have discovered a new rhodium dihydride (RhH2) with high volumetric hydrogen density (163.7 g/L). Compressing rhodium in fluid hydrogen at ambient temperature, the fcc rhodium metal absorbs hydrogen and expands unit-cell volume by two discrete steps to form NaCl-typed fcc rhodium monohydride at 4 GPa and fluorite-typed fcc RhH2 at 8 GPa. RhH2 is the first dihydride discovered in the platinum group metals under high pressure. Our low-temperature experiments show that RhH2 is recoverable after releasing pressure cryogenically to 1 bar and is capable of retaining hydrogen up to 150 K for minutes and 77 K for an indefinite length of time.
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