RT info:eu-repo/semantics/article
T1 Hydrogen Chemical Configuration and Thermal Stability in Tungsten Disulfide Nanoparticles Exposed to Hydrogen Plasma
A1 Laikhtman, Alex
A1 Makrinich, Gennady
A1 Sezen, Meltem
A1 Yildizhan, Melike Mercan
A1 Martínez, Jose Luís
A1 Dinescu, Doru
A1 Prodana, Mariana
A1 Enachescu, Marius
A1 Alonso Martín, Julio Alfonso
A1 Zak, Alla
K1 Hydrogen Plasma
K1 Plasma de hidrógeno
AB The chemical configuration and interaction mechanism of hydrogen adsorbed in inorganic nanoparticles of WS2 are investigated. Our recent approaches of using hydrogen activated by either microwave or radiofrequency plasma dramatically increased the efficiency of its adsorption on the nanoparticle surface. In the current work we put an emphasis on elucidation of the chemical configuration of the adsorbed hydrogen. This configuration is of primary importance as it affects its adsorption stability and possibility of release. To get insight on the chemical configuration, we combined the experimental analysis methods with theoretical modeling based on the density functional theory (DFT). Micro-Raman spectroscopy was used as a primary tool to elucidate chemical bonding of hydrogen and to distinguish between chemi- and physisorption. Hydrogen adsorbed in molecular form (H2) was clearly identified in all plasma-hydrogenated WS2 nanoparticles samples. It was shown that the adsorbed hydrogen is generally stable under high vacuum conditions at room temperature, which implies its stability at the ambient atmosphere. A DFT model was developed to simulate the adsorption of hydrogen in the WS2 nanoparticles. This model considers various adsorption sites and identifies the preferential locations of the adsorbed hydrogen in several WS2 structures, demonstrating good concordance between theory and experiment and providing tools for optimizing hydrogen exposure conditions and the type of substrate materials.
PB American Chemical Society
SN 1932-7447
YR 2017
FD 2017
LK http://uvadoc.uva.es/handle/10324/29141
UL http://uvadoc.uva.es/handle/10324/29141
LA eng
NO Journal of Physical Chemistry C, 2017, 121 (21), pp 11747–11756
NO Producción Científica
DS UVaDOC
RD 02-dic-2024