The critical role of bulk density of graphene oxide in tuning its defect concentration through microwave-driven annealing

Ogino, Isao; Fukazawa, Go; Kamatari, Shunsuke; Iwamura, Shinichiroh; Mukai, Shin R.

doi:10.1016/j.jechem.2017.09.010

Cited by 7 publications

(2 citation statements)

References 39 publications

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“…According to the SEM images, the amount of graphene in the aerogel seems to be higher than that previously calculated by TGA analysis (Table 1), where more than half of the weight of the sample is assigned to carbonized R/F polymer. This may be explained by the different densities of R/F and rGO, ≈1.9 and ≈0.1 g cm −3 , respectively, [38] and also because the graphene structures are very light but they occupy a lot of volume compared to the gel matrix which is more compact. Thus, the aerogels possess a large amount of graphene volume with respect to R/F polymer, as confirmed by SEM images.…”

Section: Morphology Of the 3d Networkmentioning

confidence: 99%

Ultralight‐Weight Graphene Aerogels with Extremely High Electrical Conductivity

Santos‐Gómez

Garcı́a

Montes-Morán

et al. 2021

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The integration of 2D graphene sheets into a porous and macroscopic structure is extremely attractive for application in several electrochemical fields. In this regard, for the first time, the synthesis of 3D graphene aerogels is reported by using a rapid, easy, cost‐effective, and scalable at industrial level methodology. These aerogels integrate the intrinsic properties of graphene with a high pore volume. To achieve this ultraporous graphene network, resorcinol/formaldehyde polymer with controllable porosity is employed as a binder and a cross‐linker material, and a graphene oxide solution provides the graphene building blocks. Two series of materials with and without catalyst for resorcinol/formaldehyde reaction and with different synthesis conditions and graphene contents are studied. The resulting graphene aerogels present low density, large macroporosity, and electrical conductivity values as high as 852 S m−1, with 97.58% of porosity, which is the highest value of electrical conductivity reported so far in the literature for ultralight‐weight graphene aerogels.

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Section: Morphology Of the 3d Networkmentioning

confidence: 99%

Ultralight‐Weight Graphene Aerogels with Extremely High Electrical Conductivity

Santos‐Gómez

Garcı́a

Montes-Morán

et al. 2021

Small

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“…The properties of graphene vary with the functional groups attached to the graphene surface (e.g., GO has different functional groups: carboxyl, carbonyl, hydroxyl and epoxide [9]) as a result of the oxidation or modification/functionalization of graphene. The same is true for the specific surface area and density of defects in graphene sheets [90,91]. For a monolayer graphene, the theoretical value of the specific surface area is 2630 m 2 /g [92], whereas for monolayer GO, the estimated surface area is 2391 m 2 /g [93].…”

Section: Surface Featuresmentioning

confidence: 80%

A Review on the Progress and Future of TiO2/Graphene Photocatalysts

et al. 2022

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TiO2 is seen as a low cost, well-known photocatalyst; nevertheless, its sluggish charge kinetics does limit its applications. To overcome this aspect, one of the recent approaches is the use of its composites with graphene to enhance its photoactivity. Graphene-based materials (nanosheets, quantum dots, etc.) allow for attachment with TiO2 nanostructures, resulting in synergistic properties and thus increasing the functionality of the resulting composite. The current review aims to present the marked progress recently achieved in the use of TiO2/graphene composites in the field of photocatalysis. In this respect, we highlight the progress and insights in TiO2 and graphene composites in photocatalysis, including the basic mechanism of photocatalysis, the possible design strategies of the composites and an overview of how to characterize the graphene in the mixed composites. The use of composites in photocatalysis has also been reviewed, in which the recent literature has opened up more questions related to the reliability, potential, repeatability and connection of photocatalytic mechanisms with the resulting composites. TiO2/graphene-based composites can be a green light in the future of photocatalysis, targeting pollution remediation, energy generation, etc.

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A critical review on thermal conductivity enhancement of graphene-based nanofluids

Pavía

Alajami

Estellé

et al. 2021

Advances in Colloid and Interface Science

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Nanofluids which consist of nanoparticles added to conventional fluids (or base fluids) are considered as promising heat transfer fluids. Compared to metal, metal oxide nanoparticles and carbon nanotubes, graphene with its extremely high intrinsic thermal conductivity became the best candidate to design nanofluids. Such nanofluids have the potential to be highlyefficient heat transfer fluid by reducing loss of heat and increasing cooling rates. Over the last ten years, graphene-based nanofluids have shown significant thermal conductivity enhancements, however due to the numerous and interlinked parameters to consider, optimisation of their efficiency is still challenging. The present review article analyses and discusses the reported thermal conductivity in term of performance with respect to the amount of the used graphene to develop the prepared nanofluids. The enhancement of thermal conductivity must meet the minimal graphene amount due to its production cost and because graphene nanoparticles induces high viscosity in the nanofluid leading to higher energy consumption for the heat transfer systems. Unprecedented in the literature, this work proposes a simple approach to quantitatively compare the enhancement of the thermal conductivity of the nanofluids. The thermal conductivity performance parameter introduced could be applied to all nanofluid families and may become a reference tool in the nanofluid community. Such tool will help to determine the optimal preparation conditions without compromising the superior thermal performances.

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The critical role of bulk density of graphene oxide in tuning its defect concentration through microwave-driven annealing

Cited by 7 publications

References 39 publications

Ultralight‐Weight Graphene Aerogels with Extremely High Electrical Conductivity

Ultralight‐Weight Graphene Aerogels with Extremely High Electrical Conductivity

A Review on the Progress and Future of TiO2/Graphene Photocatalysts

A critical review on thermal conductivity enhancement of graphene-based nanofluids

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