Evidence of Molecular Hydrogen Trapped in Two-Dimensional Layered Titanium Carbide-Based MXene
Naresh C. Osti, Michael Naguib, Madhu Sudan Tyagi, Yury Gogotsi, Alexander I. Kolesnikov, Eugene Mamontov
The presence of molecular hydrogen at ambient conditions in a MXene (Ti3C2Tx)) material is revealed by inelastic and elastic neutron scattering. Inelastic neutron scattering spectrum measured at 5 K shows a peak at 14.6 meV, providing a clear indication of the presence of para hydrogen in the MXene synthesized using 48% HF and annealed at 110 °C in vacuum. Increase in the measurement temperature gradually reduces the peak intensity and increases the peak width due to the mobility of the molecular hydrogen in confinement. The presence of molecular hydrogen is further confirmed from the observed elastic intensity drop in a fixed energy-window scan of elastic measurements in the temperature range of 10 to 35 K. Using more mild etching conditions, intercalation or increase in the annealing temperature result in absence of the trapped hydrogen molecules in MXene.
, Naguib, M.
, Tyagi, M.
, Gogotsi, Y.
, Kolesnikov, A.
and Mamontov, E.
Evidence of Molecular Hydrogen Trapped in Two-Dimensional Layered Titanium Carbide-Based MXene, Physical Review Materials, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=923487
(Accessed November 30, 2023)