Neutron spectroscopy study of the diffusivity of hydrogen in MoS2

The diffusion of hydrogen adsorbed inside layered MoS2 crystals has been studied by means of quasi-elastic neutron scattering, neutron spin-echo spectroscopy, nuclear reaction analysis, and X-ray photoelectron spectroscopy. The neutron time-of-flight and neutron spin-echo measurements demonstrate fa...

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Published inPhysical chemistry chemical physics : PCCP Vol. 23; no. 13; pp. 7961 - 7973
Main Authors Kuznetsov, Vitalii, Lohstroh, Wiebke, Rogalla, Detlef, Becker, Hans-Werner, Strunskus, Thomas, Nefedov, Alexei, Kovacevic, Eva, Traeger, Franziska, Fouquet, Peter
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 07.04.2021
Subjects
Diffusion layers
Diffusion rate
Elastic scattering
Hydrogen
Hydrogen atoms
Molybdenum disulfide
Neutron scattering
Neutrons
Nuclear reactions
Photoelectrons
Room temperature
Spectrum analysis
Surface diffusion
Time of flight photoelectron coincidence spectroscopy
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Summary:The diffusion of hydrogen adsorbed inside layered MoS2 crystals has been studied by means of quasi-elastic neutron scattering, neutron spin-echo spectroscopy, nuclear reaction analysis, and X-ray photoelectron spectroscopy. The neutron time-of-flight and neutron spin-echo measurements demonstrate fast diffusion of hydrogen molecules parallel to the basal planes of the two dimensional crystal planes. At room temperature and above, this intra-layer diffusion is of a similar speed to the surface diffusion that has been observed in earlier studies for hydrogen atoms on Pt surfaces. A significantly slower hydrogen diffusion was observed perpendicular to the basal planes using nuclear reaction analysis.
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ISSN:1463-9076
1463-9084
DOI:10.1039/d0cp05136e