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Entanglement of N-doped graphene in resorcinol-formaldehyde: Effect over nanoconfined LiBH4 for hydrogen storage
Entanglement of N-doped graphene in resorcinol-formaldehyde: Effect over nanoconfined LiBH4 for hydrogen storage
- Source :
- Carbon. 147:284-294
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- 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 LiBH4 at 30, 50 and 70 vol %. Differential scanning calorimetry of the nanoconfined hydrides illustrates how N-doped matrix promotes a decrease in LiBH4 decomposition temperature, and this effect was quantified by volumetric studies. Powder diffraction revealed a peak at 12.6° attributed to the interaction of LiBH4 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 LiBH4 filling, as illustrated by the proposed model.
- Subjects :
- Materials science
Hydrogen
Graphene
Thermal decomposition
Oxide
chemistry.chemical_element
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Amorphous solid
law.invention
Hydrogen storage
chemistry.chemical_compound
Differential scanning calorimetry
chemistry
Chemical engineering
law
General Materials Science
0210 nano-technology
Mesoporous material
Subjects
Details
- ISSN :
- 00086223
- Volume :
- 147
- Database :
- OpenAIRE
- Journal :
- Carbon
- Accession number :
- edsair.doi...........52ffd6ac12f2cd4ea8bf3347cc57137e
- Full Text :
- https://doi.org/10.1016/j.carbon.2019.02.090