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Título
Hydrogen Chemical Configuration and Thermal Stability in Tungsten Disulfide Nanoparticles Exposed to Hydrogen Plasma
Autor
Año del Documento
2017
Editorial
American Chemical Society
Descripción
Producción Científica
Documento Fuente
Journal of Physical Chemistry C, 2017, 121 (21), pp 11747–11756
Resumen
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.
Palabras Clave
Hydrogen Plasma
Plasma de hidrógeno
ISSN
1932-7447
Revisión por pares
SI
Patrocinador
Ministerio de Economía, Industria y Competitividad (Project MAT2014- 54378-R)
Junta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. VA050U14)
Junta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. VA050U14)
Version del Editor
Idioma
eng
Derechos
openAccess
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