Chemistry with Graphene and Graphene Oxide—Challenges for Synthetic Chemists

Eigler, Siegfried; Hirsch, Andreas

doi:10.1002/anie.201402780

Cited by 765 publications

(586 citation statements)

References 254 publications

(238 reference statements)

Supporting

Mentioning

567

Contrasting

Unclassified

Order By: Relevance

“…50 In addition, by nanocomposite synthesis, the facial functionalized hydroxyl, carboxyl and epoxide can interact with metal precursors, which is helpful for the nucleation and formation of oxide nanoparticles. 24 Co 3 O 4 supported on graphene nanocomposites with 2D or 3D structures exhibited superior ORR electrocatalytic activity in alkaline media. [51][52][53] Due to the strong covalent interaction between N and Co, the Co 3+ in Co 3 O 4 can be partially reduced to Co 2+ and it varies spatially on and among individual Co 3 O 4 nanocrystal/graphene nanosheets.…”

Section: Cobalt Oxide (Coo X )mentioning

confidence: 99%

Graphene-based transition metal oxide nanocomposites for the oxygen reduction reaction

et al. 2015

View full text Add to dashboard Cite

The development of low cost, durable and efficient nanocatalysts to substitute expensive and rare noble metals (e.g. Pt, Au and Pd) in overcoming the sluggish kinetic process of the oxygen reduction reaction (ORR) is essential to satisfy the demand for sustainable energy conversion and storage in the future. Graphene based transition metal oxide nanocomposites have extensively been proven to be a type of promising highly efficient and economic nanocatalyst for optimizing the ORR to solve the world-wide energy crisis. Synthesized nanocomposites exhibit synergetic advantages and avoid the respective disadvantages.In this feature article, we concentrate on the recent leading works of different categories of introduced transition metal oxides on graphene: from the commonly-used classes (FeO x , MnO x , and CoO x ) to some rare and heat-studied issues (TiO x , NiCoO x and Co-MnO x ). Moreover, the morphologies of the supported oxides on graphene with various dimensional nanostructures, such as one dimensional nanocrystals, two dimensional nanosheets/nanoplates and some special multidimensional frameworks are further reviewed.The strategies used to synthesize and characterize these well-designed nanocomposites and their superior properties for the ORR compared to the traditional catalysts are carefully summarized. This work aims to highlight the meaning of the multiphase establishment of graphene-based transition metal oxide nanocomposites and its structural-dependent ORR performance and mechanisms.

show abstract

Section: Cobalt Oxide (Coo X )mentioning

confidence: 99%

Graphene-based transition metal oxide nanocomposites for the oxygen reduction reaction

et al. 2015

View full text Add to dashboard Cite

show abstract

“…There are two approaches to graphene fabrication: top-down one such as the mechanical [13] or chemical graphite exfoliation [14,15], and bottom-up one such as chemical vapor deposition (CVD) of organic precursors [16] or silicon carbide thermal decomposition [17].…”

Section: Introductionmentioning

confidence: 99%

“…Graphite can be exfoliated by intercalation [18], oxidation (with subsequent reduction) [15] or sonication in organic solvents or water solutions of surfactants or polymers [14]. Graphene synthesis by chemical functionalization of graphite with intercalating compounds or its oxidation by modified Hummers method is a multistep process consequently resulting in a contaminated and defected product particularly when it comes to graphene oxide [19].…”

Section: Introductionmentioning

confidence: 99%

Graphene/Na carboxymethyl cellulose composite for Li-ion batteries prepared by enhanced liquid exfoliation

Naboka

Yim

Abu-Lebdeh

2016

Materials Science and Engineering: B

View full text Add to dashboard Cite

Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1016/j.mseb.2016.04.003Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Graphene/Na carboxymethyl cellulose composite for Li-ion batteries prepared by enhanced liquid exfoliation Naboka, Olga; Yim, Chae-Ho; Abu-Lebdeh, Yaser http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/droits L'accès à ce site Web et l'utilisation de son contenu sont assujettis aux conditions présentées dans le site LISEZ CES CONDITIONS ATTENTIVEMENT AVANT D'UTILISER CE SITE WEB. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/eng/view/object/?id=53b49153-7e23-4e60-9847-41177eef882f http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/voir/objet/?id=53b49153-7e23-4e60-9847-41177eef882f In the present work, we report a sonication-assisted exfoliation method of graphene preparation enhanced by the use of microwave heating and "green" exfoliant -sodium carboxymethyl cellulose (NaCMC). Introducing microwave heating during sonication of graphite dispersions in aqueous solutions of NaCMC results in the formation of graphene dispersions with concentration as high as 4.29 mg/ml. It is found that drying the dispersions results in the formation of graphene/NaCMC composites with graphene content up to 38.65 wt%. A study of the composite with High Resolution Transmission Electron Microscopy and Raman Spectroscopy reveals the formation of few-layer graphene approximately below five layers. The as-prepared graphene/NaCMC composite shows higher capacities than commercial graphite in Li-ion half cells reaching 397 mAh/g (graphene) . Also, when the composite is used with a nanosilicon (33 wt%) in a Li-ion half cell high initial reversible capacities of 1611 mAh/g (Si) with good cyclability and rate capability have been reached.

show abstract

“…Mechanistic study of the photoinduced reduction of GO The quality of GO depends strongly on the preparation conditions, 31 as not only the contribution of functional groups but also the integrity of the carbon framework differs from one synthetic method to another. A variation in the density of defects up to several % is well known.…”

Section: Resultsmentioning

confidence: 99%

“…A variation in the density of defects up to several % is well known. 31,32 In this work, we use two types of GO: a commercial source of GO from Cheap Tubes (CT-GO) and oxo-functionalized graphene (oxo-G 1 ), which exhibits an average density of defects of only 0.3% within the carbon skeleton (Fig. 3a).…”

Section: Resultsmentioning

confidence: 99%

High quality reduced graphene oxide flakes by fast kinetically controlled and clean indirect UV-induced radical reduction

et al. 2016

Self Cite

View full text Add to dashboard Cite

This work highlights a surprisingly simple and kinetically controlled highly efficient indirect method for the production of high quality reduced graphene oxide (rGO) flakes via UV irradiation of aqueous dispersions of graphene oxide (GO), in which the GO is not excited directly. While the direct photoexcitation of aqueous GO (when GO is the only light-absorbing component) takes several hours of reaction time at ambient temperature (4 h) leading only to a partial GO reduction, the addition of small amounts of isopropanol and acetone (2% and 1%) leads to a dramatically shortened reaction time by more than two orders of magnitude (2 min) and a very efficient and soft reduction of graphene oxide. This method avoids the formation of non-volatile species and in turn contamination of the produced rGO and it is based on the highly efficient generation of reducing carbon centered isopropanol radicals via the reaction of triplet acetone with isopropanol. While the direct photolysis of GO dispersions easily leads to degradation of the carbon lattice of GO and thus to a relatively low electric conductivity of the films of flakes, our indirect photoreduction of GO instead largely avoids the formation of defects, keeping the carbon lattice intact.Mechanisms of the direct and indirect photoreduction of GO have been elucidated and compared.Raman spectroscopy, XPS and conductivity measurements prove the efficiency of the indirect photoreduction in comparison with the state-of-the-art reduction method for GO (hydriodic acid/trifluoroacetic acid). The rapid reduction times and water solvent containing only small amounts of isopropanol and acetone may allow easy process up-scaling for technical applications and low-energy consumption.

show abstract

Chemistry with Graphene and Graphene Oxide—Challenges for Synthetic Chemists

Cited by 765 publications

References 254 publications

Graphene-based transition metal oxide nanocomposites for the oxygen reduction reaction

Graphene-based transition metal oxide nanocomposites for the oxygen reduction reaction

Graphene/Na carboxymethyl cellulose composite for Li-ion batteries prepared by enhanced liquid exfoliation

High quality reduced graphene oxide flakes by fast kinetically controlled and clean indirect UV-induced radical reduction

Contact Info

Product

Resources

About