Dataset Information

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

ABSTRACT: 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 ?/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 ? /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.

SUBMITTER: He J

PROVIDER: S-EPMC6632024 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature

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Publications

Quality Improvement of Few-Layers Defective Graphene from Biomass and Application for H<sub>2</sub> Generation.

He Jinbao J Anouar Aicha A Primo Ana A García Hermenegildo H

Nanomaterials (Basel, Switzerland) 20190619 6

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 ...[more]

PMID: 31248147

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Project description:INTRODUCTION:'Systems thinking' is often recommended in healthcare to support quality and safety activities but a shared understanding of this concept and purposeful guidance on its application are limited. Healthcare systems have been described as complex where human adaptation to localised circumstances is often necessary to achieve success. Principles for managing and improving system safety developed by the European Organisation for the Safety of Air Navigation (EUROCONTROL; a European intergovernmental air navigation organisation) incorporate a 'Safety-II systems approach' to promote understanding of how safety may be achieved in complex work systems. We aimed to adapt and contextualise the core principles of this systems approach and demonstrate the application in a healthcare setting. METHODS:The original EUROCONTROL principles were adapted using consensus-building methods with front-line staff and national safety leaders. RESULTS:Six interrelated principles for healthcare were agreed. The foundation concept acknowledges that 'most healthcare problems and solutions belong to the system'. Principle 1 outlines the need to seek multiple perspectives to understand system safety. Principle 2 prompts us to consider the influence of prevailing work conditions-demand, capacity, resources and constraints. Principle 3 stresses the importance of analysing interactions and work flow within the system. Principle 4 encourages us to attempt to understand why professional decisions made sense at the time and principle 5 prompts us to explore everyday work including the adjustments made to achieve success in changing system conditions.A case study is used to demonstrate the application in an analysis of a system and in the subsequent improvement intervention design. CONCLUSIONS:Application of the adapted principles underpins, and is characteristic of, a holistic systems approach and may aid care team and organisational system understanding and improvement.

Dataset Information

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

Publications

Quality Improvement of Few-Layers Defective Graphene from Biomass and Application for H<sub>2</sub> Generation.

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