Multilayer N‐doped Graphene Films as Photoelectrodes for H<sub>2</sub> Evolution

Albero, Josep; Garcı́a, Hermenegildo

doi:10.1002/cptc.201700049

Cited by 10 publications

(6 citation statements)

References 27 publications

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“…The (N)G and G films were used as electrodes for hydrogen evolution reaction. A similar test was carried out in previous work from the group, using (N)G film as the working electrode and aqueous Na 2 S/Na 2 SO 3 solution as electrolyte under illumination of a UV/Vis 300 W Xe lamp [26]. In the present work, line-sweep voltammograms (LSV) were performed with the graphene electrodes at a scan rate of 50 mV/s in darkness or under LED lighting, using a 1 M LiClO 4 aqueous solution as electrolyte.…”

Section: Resultsmentioning

confidence: 99%

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

Anouar

Primo

et al. 2019

Nanomaterials

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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.

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Section: Resultsmentioning

confidence: 99%

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

Anouar

Primo

et al. 2019

Nanomaterials

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“…g‐C 3 N 4 is another typical two‐dimensional conjugated polymer material with great potential to be used as a photocatalyst. Compared with graphene, g‐C 3 N 4 has a better electronic energy band for photocatalysis and is also rich in electrons, which benefits the charge mobility . Since the discovery of g‐C 3 N 4 photocatalytic decomposition of H 2 O to produce H 2 reported by Wang and co‐workers in 2009, g‐C 3 N 4 ‐based photocatalysts have rapidly become among the most intensely research materials in this field.…”

Section: Catalysts For Photocatalytic Lignin Conversionmentioning

confidence: 99%

Photocatalytic Conversion of Lignin into Chemicals and Fuels

et al. 2020

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Lignin, an underutilized component of lignocellulosic biomass, is regarded as a rich reservoir for the production of aromatic chemicals and fuels. Despite extensive research in recent years, lignin's potential is far from being fully unlocked. Photocatalysis that uses sustainable solar energy to drive lignin conversion under mild conditions has been identified as a promising strategy and received growing research interest. This review aims to present a critical introduction to the photocatalytic conversion of lignin, including a summary of lignin conversion pathways and mechanisms, as well as the latest cutting‐edge innovations on photocatalyst design and reactor construction. Moreover, the screening of solvents and regulation of other key factors that are involved in photocatalytic lignin conversion are also elucidated and future perspectives and challenges for photocatalytic conversion of lignin into valuable products are discussed.

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“…Fe 3+ linked not only TiO 2 and Eosin Y but also different dye molecules to form a multilayer dye structure via chemical bonding, thus enhancing light harvesting efficiency and overcoming the quenching and insulating effect of the dye layers. Multilayer N-doped graphene photoelectrodes have even been prepared to work as both semitransparent electrodes and efficient photoelectrocatalysts for H 2 evolution at low bias [ 120 ], thus avoiding the need for expensive substrates such as fluorine-doped tin oxide (FTO), indium-doped tin oxide (ITO), or aluminum-doped zinc oxide (AZO) and relying on omnipresent C as the sole source for the substrate and active material.…”

Section: Parameters Of Films Affecting Their Solar Photocatalytic Act...mentioning

confidence: 99%

Solar-Driven Photocatalytic Films: Synthesis Approaches, Factors Affecting Environmental Activity, and Characterization Features

et al. 2022

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Solar-powered photocatalysis has come a long way since its humble beginnings in the 1990s, producing more than a thousand research papers per year over the past decade. In this review, immobilized photocatalysts operating under sunlight are highlighted. First, a literature review of solar-driven films is presented, along with some fundamental operational differences in relation to reactions involving suspended nanoparticles. Common strategies for achieving sunlight activity from films are then described, including doping, surface grafting, semiconductor coupling, and defect engineering. Synthetic routes to fabricate photocatalytically active films are briefly reviewed, followed by the important factors that determine solar photocatalysis efficiency, such as film thickness and structure. Finally, some important and specific characterization methods for films are described. This review shows that there are two main challenges in the study of photocatalytic materials in the form of (thin) films. First, the production of stable and efficient solar-driven films is still a challenge that requires an integrated approach from synthesis to characterization. The second is the difficulty in properly characterizing films. In any case, the research community needs to address these, as solar-driven photocatalytic films represent a viable option for sustainable air and water purification.

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Multilayer N‐doped Graphene Films as Photoelectrodes for H₂ Evolution

Cited by 10 publications

References 27 publications

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

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

Photocatalytic Conversion of Lignin into Chemicals and Fuels

Solar-Driven Photocatalytic Films: Synthesis Approaches, Factors Affecting Environmental Activity, and Characterization Features

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Multilayer N‐doped Graphene Films as Photoelectrodes for H2 Evolution

Cited by 10 publications

References 27 publications

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

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

Photocatalytic Conversion of Lignin into Chemicals and Fuels

Solar-Driven Photocatalytic Films: Synthesis Approaches, Factors Affecting Environmental Activity, and Characterization Features

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Multilayer N‐doped Graphene Films as Photoelectrodes for H₂ Evolution