jp9b03927_si_001.pdf (226.01 kB)
Electron- and Thermal-Stimulated Synthesis of Water on Boehmite (γ-AlOOH) Nanoplates
journal contribution
posted on 2019-07-24, 16:33 authored by Brant
M. Jones, Alexandr Aleksandrov, Xin Zhang, Kevin M. Rosso, Thomas M. OrlandoUtilizing
a combination of electron-stimulated desorption, infrared
spectroscopy, and temperature program desorption measurements, we
show that molecular water is synthesized during electron irradiation
on boehmite nanoplates and postulate that the reaction proceeds first
through decomposition of the hydroxyl to produce trapped hydrogen
atoms. Once released, these hydrogen atoms can react with a neighboring
hydroxyl resulting in adsorbed water. In addition, molecular water
is readily formed on the surface of the boehmite nanosheets through
thermal-induced recombinative desorption. Peak water production via
recombinative desorption occurs at 750 K in agreement with previous
studies. We have also identified a weak desorption feature near 400
K, which is likely strongly adsorbed water. The derived experimental
desorption activation energy of water assuming full coverage is 98.6
kJ mol–1.