Artículo
Entanglement of N-doped graphene in resorcinol-formaldehyde: Effect over nanoconfined LiBH 4 for hydrogen storage
Gasnier, Aurelien
; Luguet, Margaux; González Pereira, Amaru; Troiani, Horacio Esteban
; Zampieri, Guillermo Enrique
; Gennari, Fabiana Cristina
Fecha de publicación:
06/2019
Editorial:
Pergamon-Elsevier Science Ltd
Revista:
Carbon
ISSN:
0008-6223
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
N-doped graphene hydrogels were prepared by crosslinking graphene oxide with ethylenediamine. These materials presented 10 at. % nitrogen, as determined by X-ray photoelectron spectroscopy. N-doped graphene was entangled within mesoporous matrices by diffusion of resorcinol-formaldehyde solutions throughout the hydrogels. According to nitrogen desorption isotherms, N-doping graphene slightly reduces the pore size and volume toward values closer to the graphene-free resins. The underlying graphene framework was observed within the amorphous porous carbon by transmission microscopy. These porous materials were impregnated with LiBH 4 at 30, 50 and 70 vol %. Differential scanning calorimetry of the nanoconfined hydrides illustrates how N-doped matrix promotes a decrease in LiBH 4 decomposition temperature, and this effect was quantified by volumetric studies. Powder diffraction revealed a peak at 12.6° attributed to the interaction of LiBH 4 with the N-doped matrix. Owing to Yates analysis, N-doping lowers hydrogen release temperature by 10 °C, while at 325 °C the quantity released is increased by 1 wt %. This effect is more important than the diminution of pore size from 10 to 5 nm and compensates the presence of graphene. The benefit from N-doping is more remarkable for lower size of pores and higher LiBH 4 filling, as illustrated by the proposed model.
Palabras clave:
HYDROGEN STORAGE
,
GRAPHENE
,
LIBH4
,
N-DOPED
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Colecciones
Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Citación
Gasnier, Aurelien; Luguet, Margaux; González Pereira, Amaru; Troiani, Horacio Esteban; Zampieri, Guillermo Enrique; et al.; Entanglement of N-doped graphene in resorcinol-formaldehyde: Effect over nanoconfined LiBH 4 for hydrogen storage; Pergamon-Elsevier Science Ltd; Carbon; 147; 6-2019; 284-294
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