High pressure synthesis and stability of cobalt hydrides

Wang, Mengnan; Binns, Jack; Donnelly, Mary-Ellen; Peña-Alvarez, Miriam; Dalladay-Simpson, Philip; Howie, Ross T.

doi:10.1063/1.5026535

Title: High pressure synthesis and stability of cobalt hydrides

Journal Article · 14 April 2018 · Journal of Chemical Physics

DOI: https://doi.org/10.1063/1.5026535 · OSTI ID:1512949

Wang, Mengnan ^[1];

^[1]; Donnelly, Mary-Ellen ^[1]; Peña-Alvarez, Miriam ^[2]; Dalladay-Simpson, Philip ^[1]; Howie, Ross T. ^[1]

Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
Univ. of Edinburgh, Scotland (United Kingdom). School of Physics and Astronomy and Centre for Science at Extreme Conditions

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.

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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, Vol. 148, Issue 14; ISSN 0021-9606

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 21 works

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