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Título: Hydrogen Chemical Configuration and Thermal Stability in Tungsten Disulfide Nanoparticles Exposed to Hydrogen Plasma
Autor: Laikhtman, Alex
Makrinich, Gennady
Sezen, Meltem
Yildizhan, Melike Mercan
Martínez, Jose Luís
Dinescu, Doru
Prodana, Mariana
Enachescu, Marius
Alonso Martín, Julio Alfonso
Zak, Alla
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
DOI: 10.1021/acs.jpcc.7b00074
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)
Version del Editor:
Idioma: eng
Derechos: info:eu-repo/semantics/embargoedAccess
Aparece en las colecciones:DEP33 - Artículos de revista

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