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Quality improvement of few-layers defective graphene from biomass and application for H2 Generation

AuthorsHe, J.; Anouar, A.; Primo, A.; García Gómez, Hermenegildo
Issue Date19-Jul-2019
PublisherMolecular Diversity Preservation International
CitationNanomaterials 9(6): 895 (2019)
AbstractPyrolysis of filmogenic natural polymers gives rise to the formation of films of few-layers defective, undoped, and doped graphenes with low electrical conductivity (3000 to 5000 W/sq). For the sake of valorization of biomass wastes, it would be of interest to decrease the density of structural defects in order to increase the conductivity of the resulting few-layers graphene samples. In the present study, analytical and spectroscopic evidence is provided showing that by performing the pyrolysis at the optimal temperature (1100 °C), under a low percentage of H, a significant decrease in the density of defects related to the presence of residual oxygen can be achieved. This improvement in the quality of the resulting few-layers defective graphene is reflected in a decrease by a factor of about 3 or 5 for alginic acid and chitosan, respectively, of the electrical resistance. Under optimal conditions, few-layers defective graphene films with a resistance of 1000 Ω/sq were achieved. The electrode made of high-quality graphene prepared at 1100 °C under Ar/H achieved a H production of 3.62 μmol with a positive applied bias of 1.1 V under LED illumination for 16 h.
Publisher version (URL)http://dx.doi.org/10.3390/nano9060895
Identifiersdoi: 10.3390/nano9060895
issn: 2079-4991
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