Kuznetsov, V.; Lohstroh, W.; Rogalla, D.; Becker, H.W.; Strunskus, T.; Nefedov, A.; Kovacevic, E.; Traeger, F.; Fouquet, P.: Neutron spectroscopy study of the diffusivity of hydrogen in MoS2. Physical Chemistry Chemical Physics 23 (2021), p. 7961-7973
10.1039/d0cp05136e
Open Access Version (externer Anbieter)
Abstract:
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.