Artículo
Effect of the carbon mesoporous structure on the transport properties of confined lithium chloride aqueous solutions
Fuentes Quezada, Eduardo
; Maldonado Ochoa, Santiago Agustin
; Acosta, Rodolfo Héctor
; Bruno, Mariano Martin
; de la Llave, Ezequiel Pablo
; Longinotti, María Paula
; Vaca Chávez Fornasero, Fabián
; Corti, Horacio Roberto
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Fecha de publicación:
08/2021
Editorial:
Elsevier Science
Revista:
Microporous and Mesoporous Materials
ISSN:
1387-1811
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Accurate determination of fluid dynamics in confined carbons with pore size distribution (PSD) ranging from micro to mesopores is a fundamental aspect for many relevant applications, such as lithium battery electrodes, supercapacitors, or fuel cells. Here we present a synthesis route that enables the preparation of carbons with tailored PSD, which are characterized by nitrogen adsorption methods and nuclear magnetic resonance (NMR). The combination of micro and mesopores is determined straightforwardly by the determination of confined water self-diffusion coefficients and longitudinal relaxation times. Employing 2D-NMR experiments pore interconnectivity was characterized, determining exchange rates for water between micropores, mesopores, and bulk solution. Furthermore, their functionality was tested in simple ion release experiments of a solution of LiCl carried out both by conductivity and NMR experiments. We found that the lithium release rate can be set by tailoring the connectivity between micro and mesopores. For samples with mesopores larger than 5 nm and a small content of micropores, ion mobility is mainly restricted by the material's porosity. On the other hand, tortuosity analysis reveals that carbon wall-ion interaction is the main factor of the sluggish diffusion in materials with a large fraction of micropores well connected to the mesopore network.
Palabras clave:
DIFFUSIVITY
,
LITHIUM
,
MESOPORES
,
NMR
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Identificadores
Colecciones
Articulos(IFEG)
Articulos de INST.DE FISICA ENRIQUE GAVIOLA
Articulos de INST.DE FISICA ENRIQUE GAVIOLA
Citación
Fuentes Quezada, Eduardo; Maldonado Ochoa, Santiago Agustin; Acosta, Rodolfo Héctor; Bruno, Mariano Martin; de la Llave, Ezequiel Pablo; et al.; Effect of the carbon mesoporous structure on the transport properties of confined lithium chloride aqueous solutions; Elsevier Science; Microporous and Mesoporous Materials; 323; 8-2021; 1-10
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