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Title: High pressure synthesis and stability of cobalt hydrides

Journal Article · · Journal of Chemical Physics
DOI: https://doi.org/10.1063/1.5026535 · OSTI ID:1512949
 [1]; ORCiD logo [2];  [2];  [3];  [2];  [2]
  1. Center for High Pressure Science and Technology Advanced Research, Shanghai (China); none
  2. Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
  3. Univ. of Edinburgh, Scotland (United Kingdom). School of Physics and Astronomy and Centre for Science at Extreme Conditions
+ Show Author Affiliations

In situ high-pressure high-temperature X-ray powder diffraction studies of the cobalt-hydrogen system reveal the direct synthesis of both the binary cobalt hydride (CoH) and a novel cobalt dihydride (CoH2). We observe the formation of $fcc$ CoH at pressures of 4 GPa, which persists to pressures of 45 GPa. At this pressure, we see the emergence with time of a further expanded $fcc$ lattice, which we identify as CoH2, where the hydrogen atoms occupy the tetrahedral vacancies. We have explored alternative synthesis routes of CoH2 and can lower the synthesis pressure to 35 GPa by the application of high temperature. CoH2 is stable to at least 55 GPa and decomposes into CoH below 10 GPa, releasing molecular hydrogen before further decomposing completely into its constituent elements below 3 GPa. As a first-row transition metal, cobalt has a relatively lower mass than other hydride-forming transition metals, and as a result, CoH2 has a high hydrogen content of 3.3 wt. % and a volumetric hydrogen density of 214 g/l.

Research Organization:
Univ. of Chicago, IL (United States)
Sponsoring Organization:
USDOE; National Science Foundation (NSF)
Grant/Contract Number:
FG02-94ER14466; AC02-06CH11357
OSTI ID:
1512949
Journal Information:
Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 14 Vol. 148; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Ab initio studies of copper hydrides under high pressure journal April 2019
Synthesis of Ni 2 H 3 at high temperatures and pressures journal October 2018
Synthesis of new nickel hydrides at high pressure journal August 2018
Solubility of deuterium and hydrogen in fcc iron at high pressures and temperatures journal November 2019

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