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Quality Improvement of Few-Layers Defective Graphene from Biomass and Application for H2 Generation

Instituto Universitario de Tecnología Química, Consejo Superior de Investigaciones Científicas-Universitat Politècnica de Valencia, Av. De los Naranjos s/n, 46022 Valencia, Spain
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Nanomaterials 2019, 9(6), 895; https://doi.org/10.3390/nano9060895
Received: 21 May 2019 / Revised: 10 June 2019 / Accepted: 11 June 2019 / Published: 19 June 2019
Pyrolysis 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 Ω/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 H2, 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/H2 achieved a H2 production of 3.62 µmol with a positive applied bias of 1.1 V under LED illumination for 16 h. View Full-Text
Keywords: defective graphene; chitosan pyrolysis; alginate pyrolysis; graphene from biomass defective graphene; chitosan pyrolysis; alginate pyrolysis; graphene from biomass
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He, J.; Anouar, A.; Primo, A.; García, H. Quality Improvement of Few-Layers Defective Graphene from Biomass and Application for H2 Generation. Nanomaterials 2019, 9, 895.

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